Microsoft Word allows users to insert a maximum of 63 columns in a single document, providing extensive layout flexibility for complex designs.

The Outline view in PowerPoint specifically displays the presentation's structure, showing only titles and main text points for easy organization.

Mosaic is widely recognized as the first graphical web browser, playing a crucial role in popularizing the World Wide Web for general public use.

LED is an acronym for Light Emitting Diode, a semiconductor light source that emits light when current flows through it.

Micro Computers are commonly referred to as personal computers because they are designed for individual use, offering a balance of power and affordability.

DMA (Direct Memory Access) is a hardware feature that allows peripheral devices to transfer data directly to and from the computer's main memory (RAM) without requiring continuous intervention from the Central Processing Unit (CPU). Instead of the CPU handling every data transfer operation, a dedicated DMA controller manages the transfer, allowing the processor to perform other tasks simultaneously. This improves overall system performance, increases data transfer speed, and reduces CPU workload. DMA is commonly used by high-speed devices such as hard disk drives, solid-state drives (SSDs), graphics cards, sound cards, and network interface cards.

DMA plays an important role in modern computer architecture because it enables efficient communication between hardware components and memory. During a DMA operation, the controller temporarily takes control of the system bus, transfers the required data, and then returns control to the CPU. Various transfer modes, including Burst Mode, Cycle Stealing, and Transparent Mode, are used depending on the system's performance requirements. The use of DMA significantly enhances multitasking capabilities and is an essential feature in modern operating systems and computer hardware.

Why the other options are incorrect:

• Direct Module Access is not the official expansion of DMA and is not a recognized term in computer science.
• Distinct Module Access is an incorrect variation and has no accepted meaning in computer architecture.
• Data Memory Access is not the standard expansion of DMA, although it sounds similar. The correct and universally accepted term is Direct Memory Access.

In presentation software like Microsoft PowerPoint, pressing Ctrl+M is the standard shortcut to insert a new blank slide into the current presentation.

The Melissa virus, which emerged in 1999, was a fast-spreading macro virus primarily disseminated through email attachments, making it an E-mail virus.

John Vincent Atanasoff, along with Clifford Berry, is credited with inventing the Atanasoff–Berry Computer, an early electronic digital computer.

ISP (Internet Service Provider) is a company or organization that provides individuals, businesses, and institutions with access to the Internet. An ISP offers services such as broadband, fiber-optic, DSL, cable, wireless, and mobile Internet connections. In addition to Internet access, many ISPs also provide email accounts, web hosting, domain registration, cloud storage, and cybersecurity services. Users subscribe to an ISP and connect to the Internet through devices such as modems, routers, or fiber-optic terminals. Examples of ISPs include PTCL, Nayatel, StormFiber, Optix, and various mobile network operators that offer 4G and 5G Internet services.

An ISP acts as the gateway between a user's device and the global Internet by routing data packets across networks. The quality of an ISP is often measured by its download and upload speeds, reliability, coverage, customer support, and pricing. Modern ISPs use advanced networking technologies to ensure secure and high-speed connectivity for activities such as web browsing, online learning, video streaming, cloud computing, online gaming, and video conferencing. Choosing a reliable ISP is essential for maintaining a stable and efficient Internet connection.

Why the other options are incorrect:

• Internal Server Provider is not the official expansion of the acronym ISP and is not a recognized networking term.
• Internet Server Provider is an incorrect variation because ISPs provide Internet access rather than functioning solely as server providers.
• Insta Service Provider is not a valid or recognized expansion of ISP in computer networking.

The keyboard shortcut Ctrl+Shift+N is universally used on Windows operating systems to quickly create a new folder in the current directory.

The CPU, or Central Processing Unit, is the fundamental hardware component responsible for executing instructions and performing all data processing operations within a computer system.

CSS stands for Cascading Style Sheets. It is a stylesheet language used to control the appearance and layout of web pages created with HTML. CSS allows web developers to define colors, fonts, spacing, borders, backgrounds, animations, and the positioning of elements, making websites visually attractive and responsive across different devices.

The term \"Cascading\" refers to the way CSS applies styles according to a hierarchy or priority. When multiple style rules exist for the same element, the browser determines which rule takes precedence based on specificity, importance, and source order. This feature makes CSS flexible and efficient for managing the design of large websites.

CSS works alongside HTML but serves a different purpose. While HTML provides the structure and content of a webpage, CSS controls its presentation and design. Modern websites rely heavily on CSS frameworks such as Bootstrap and Tailwind CSS to create responsive layouts quickly. Therefore, the correct expansion of CSS is Cascading Style Sheets, making Option B the correct answer.

Full-duplex mode enables simultaneous two-way communication, allowing data to be sent and received over a channel at the exact same time.

Microprocessors are versatile integrated circuits that serve as the central processing unit in computers, digital devices, and calculators, enabling their operations.

Among the given options, the correct answer is "None of the above" because the smallest commonly used unit of digital storage is not listed. In computer systems, data is measured using units such as bit, byte, kilobyte (KB), megabyte (MB), gigabyte (GB), and terabyte (TB). A bit is the smallest unit of data, while a byte consists of 8 bits. Since all the listed options begin with a megabyte or larger, none represents the smallest storage unit. Therefore, "None of the above" is the correct choice.

Storage units increase in size in the following order: Bit → Byte → Kilobyte (KB) → Megabyte (MB) → Gigabyte (GB) → Terabyte (TB) → Petabyte (PB). Approximately 1,024 KB = 1 MB, 1,024 MB = 1 GB, and 1,024 GB = 1 TB (binary measurement commonly used in computing). Understanding these storage units is essential for computer literacy and is a frequently tested topic in competitive examinations related to information technology and general computer knowledge.

Why the other options are incorrect:

• Megabyte (MB) is larger than a kilobyte and a byte, so it is not the smallest storage unit.
• Gigabyte (GB) is much larger than a megabyte and is commonly used to measure the storage capacity of hard drives, SSDs, and memory cards.
• Terabyte (TB) is larger than both gigabytes and megabytes and is used to measure the capacity of modern storage devices.

Right-clicking an object typically opens a context menu, providing quick access to its properties and relevant actions.

Computer forensics is the specialized field focused on recovering and investigating data from digital devices for legal purposes.

COBOL stands for Common Business-Oriented Language, a high-level programming language primarily used for business applications.