In the computer memory hierarchy, arranged from the fastest and smallest at the top (I) to the slowest and largest at the bottom (IV), which memories represent positions I, II, III and IV in that order? Choose the correct answer from the options given below.

Processor registers sit at the top as the fastest and smallest memory, so they take position one.

Random access memory comes next, faster than disk but slower than registers, at position two.

The magnetic hard disk holds far more data at slower speed, taking position three.

Magnetic tape is the slowest and largest, resting at the bottom position four.

Speed falls and capacity rises as one moves down the memory hierarchy.

Cost per bit also drops steadily toward the slower, larger levels.