Answer:
c. 128
Explanation:
The international reference code uses 8 bits for representing characters out of which 1 bit is a parity bit. So the total number of different characters that can be represented in the International Reference Alphabet text code is given by 2^7 = 2*2*2*2*2*2*2 = 128. The parity bit is the most significant and is used to validate that the character is transmitted without any errors.
