Discussion
For even number of 1's at the input or inputs having all 0's, the output of EX-NOR gate is :
Answer: B
The output of an EX-NOR gate is High.
EX-NOR is the complement of EX-OR. An EX-OR gate gives 1 when an odd number of its inputs are 1 (it is an odd-parity detector), so the EX-NOR gives 1 when the number of 1s is even, including the case of all inputs 0 (zero 1s, which is even).
For two inputs: 00 gives 1, 01 and 10 give 0, 11 gives 1. So the output is not Low, and it is perfectly defined.
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