The standard size of an IP address is

A16 bits

B32 bits ✓ Correct

C48 bits

D64 bits

Correct answer: (B) 32 bits

Explanation

A standard IPv4 address is 32 bits long.

A size of 16 bits is too small for the IPv4 scheme.

A size of 48 bits matches a hardware MAC address, not an IP address.

A size of 64 bits does not match the IPv4 standard.

Those 32 bits are usually written as four numbers separated by dots.

Add-on: the newer IPv6 addresses are 128 bits long.

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