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Cache memory is best described as ________.

  • A.a slow but very large backing store
  • B.a small, fast memory between the processor and main memory
  • C.a portion of the hard disk used as memory
  • D.the permanent storage for the operating system

Answer: C

Correct answer: a small, fast memory between the processor and main memory

Cache holds recently and frequently used data close to the processor, so the CPU does not have to wait for the much slower main memory. It is small precisely because the fast memory it uses is expensive.

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