What logical operation is performed by a two-input exclusive NOR gate?
It produces a 0 at its output only if all inputs are 0
It produces a 1 at its output only if all inputs are 1
It produces a 0 at its output if one and only one of its inputs is 1✓Correct answer
It produces a 1 at its output if one and only one input is 1
Explanation
An exclusive NOR is the complement of exclusive OR: it outputs 1 when its two inputs match and 0 when they differ. Two inputs differ exactly when one and only one of them is 1, so that condition produces a 0 output.