Correct Answer:
B. Register
In the computer memory hierarchy, Registers have the shortest access time, making them the fastest memory component. Registers are small, high-speed storage locations directly within the CPU that hold data currently being processed. Their proximity and direct connection to the CPU allow for immediate data retrieval and manipulation.
- Cache memory is faster than RAM but slower than registers, acting as a buffer between the CPU and main memory.
- RAM (Random Access Memory) is the main memory, significantly slower than cache and registers.
- Hard Disk is the slowest memory type listed, serving as long-term, non-volatile storage.