The memory hierarchy in a typical digital computer, in order, is:

A.
CPU, cache, primary memory, secondary memory.

B.
CPU, cache, secondary memory, primary memory.

C.
CPU, secondary memory, cache, primary memory.

D.
CPU, primary memory, secondary memory, cache.

Explanation:
The correct answer is “CPU, cache, primary memory, secondary memory”. In this architecture, the
CPU sees the high-speed cache, which holds the instructions and data from primary memory that
have a high probability of being executed by the program. In order of speed of access, the order in
the correct answer goes from the fastest to the slowest access time.