Which one of the following is the fastest memory inside a computer

Cache memory

RAM

Secondary memory

Register memory is the smallest and fastest memory in a computer.
It is not a part of the main memory and is located in the CPU in the form of registers, which are the smallest data holding elements.
A register temporarily holds frequently used data, instructions, and memory address that are to be used by CPU.
They hold instructions that are currently processed by the CPU. All data is required to pass through registers before it can be processed.
So, they are used by CPU to process the data entered by the users.

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