Memory module is one of the main components of a computer system. Answer the

following questions relevant to the memory module design thoroughly and concisely.

You may draw a diagram to help you answer the questions if necessary.

A$)$ Considering the design constraints $($cost$,$ access time, capacity$)$ on a computer$$s

memory module, briefly discuss why a memory hierarchy consisting of multiple

memory components $($such as registers, caches, main memory, disks, etc.$)$ is

employed in a modern computer instead of a single memory component.