Which one of the following is NOT equivalent to \(p ↔ q\)?

GATE · 2015 · CS · Set 1 · Computer Science & ITTPSC Computer/IT Posts · 2025 · Senior Informatics Officer · Section D

1. A.

   $(\neg p \lor q) \land (p \lor \neg q)$

2. B.

   $(\neg p \lor q) \land (q \rightarrow p)$

3. C.

   $(\neg p \land q) \lor (p \land \neg q)$

4. D.

   $(\neg p \land \neg q) \lor (p \land q)$

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