If a cryptosystem is using a key size of 8, what is the keyspace size?

A.
64

B.
32

C.
256

D.
16

Explanation:
The keyspace equals 2 to the 8th, which is 256. If an algorithm allows
a key length of 2 bits, the keyspace for that algorithm would be 4, which indicates
the total number of different keys that would be possible. (Remember that we are
working in binary and that 2 to the 2nd equals 4.)