Consider a computer memory hierarchy diagram. As you travel down the memory hierarchy, which of the following is true?
ADecreasing cost per bit and decreasing access time
BIncreasing cost per bit and increasing access time
CIncreasing cost per bit and decreasing access time
DDecreasing cost per bit and increasing access time ✓ Correct
Correct answer: (D) Decreasing cost per bit and increasing access time
Explanation
Moving down the memory hierarchy, cost per bit falls while access time rises.
Top levels like registers and cache are fast but expensive per bit.
Lower levels like disks are cheap per bit yet slower to reach.
Rising cost with decreasing access time describes moving up, not down.
Both cost and access time rising cannot describe a single direction.
The hierarchy balances speed against capacity and price.
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