Arrange the following computer memory types from fastest to slowest speed:
(A) Hard Disk
(B) Main Memory (RAM)
(C) CD-ROM
(D) CPU Registers
(E) Cache Memory
Choose the correct answer from the options given below:

Correct option is D

In terms of speed, CPU Registers are the fastest, followed by Cache Memory, Main Memory (RAM), Hard Disk, and finally CD-ROM. Registers and cache memory are located within the processor, offering very high-speed access compared to main memory and secondary storage like hard disks and optical drives.
Important Key Points:
1. CPU Registers: The fastest form of memory, located directly in the CPU.
2. Cache Memory: Next in speed, used to store frequently accessed data.
3. Main Memory (RAM): Slower than cache but still much faster than secondary storage.
4. Hard Disk and CD-ROM: Represent secondary storage, with CD-ROM being slower than hard disks.
Knowledge Booster:
· CPU Registers are used for the most immediate data processing.
· Cache Memory helps reduce the time to access data from main memory.