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The compound propositions p and q are called logically equivalent if ________ is a tautology.

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The compound propositions p and q are called logically equivalent if ________ is a tautology.

(a) p ↔ q

(b) p → q

(c) ¬ (p ∨ q)

(d) ¬p ∨ ¬q

I got this question in a job interview.

The doubt is from Logics in portion The Foundation: Logics and Proofs of Discrete Mathematics

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Correct answer is (a) p ↔ q

Easy explanation: Definition of logical equivalence.

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