Cloud Computing offers various service models that define the level of control and responsibility shared between the cloud provider and the consumer. The three main service models are Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS).
The correct answer is A: SaaS. SaaS, or Software as a Service, is a cloud computing service model where a provider hosts applications and makes them available to customers over the internet. Users typically access these applications via a web browser, without needing to install or manage any software or infrastructure themselves (e.g., Gmail, Salesforce).
B: HTTP is incorrect because HTTP (Hypertext Transfer Protocol) is a protocol used for transmitting data over the web, not a cloud service model. C: HTML is incorrect because HTML (Hypertext Markup Language) is a markup language used for creating web pages, not a cloud service model. D: LAN is incorrect because LAN (Local Area Network) refers to a computer network that interconnects computers within a limited area, such as a home or office, and is not a cloud computing service model.