Q. 18 For computers based on three-address instruction formats, each address field can
be used to specify which of the following:
S1: A memory operand S2: A processor register S3: An implied accumulator register
(A) Either S1 or S2
(B) Either S2 or S1
(C) Only S2 and S3
(D) All of S1, S2 and S3
Answer: (A)
Explanation:
