Engineering Mathematics Set Theory & Algebra Boolean Algebra

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

1
(¬ p ⋁ q) ⋀ (p ⋁ ¬ q)
2
(¬ p ⋁  q) ⋀ (q → p)
3
(¬ p ⋀ q) ⋁  (p ⋀ ¬ q)
4
(¬ p ⋀ ¬ q) ⋁  (p ⋀ q)

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