A processor can support a maximum memory of 4 GB, where

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A processor can support a maximum memory of 4 GB, where the memory is word-addressable (a word consists of two bytes). The size of the address bus of the processor is at least _________bits.

1. 31
2. 13
3. 19
4. 34

Correct Option: A

Maximum memory = 4 GB = 2³² bytes
Size of a word = 2 bytes
Therefore, Number of words = 2³² / 2 = 2³¹
So, we require 31 bits for the address bus of the processor.