Discussion
Which memory is fastest ?
Answer: D
The fastest memory of these is cache.
Cache memory is small, fast SRAM built into or right beside the processor. It holds copies of the data and instructions the processor is using most, so they can be read in a few clock cycles instead of waiting for main memory.
In the memory hierarchy, speed falls and size grows as you move away from the processor: registers, then cache, then main memory (RAM and ROM), then secondary storage such as a hard disk, which is thousands of times slower than RAM.
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