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What does the following expression stand for?

publish date: 2022/06/12 12:35:00 GMT+10

A ↔ B

(A → B) ∧ (B → A)

(A ∧ B) ∨ (B ∧ A)

(A ∨ B) ∧ (B ∨ A)

(A ¬ B) ∨ (B ¬ A)

Mathematical Structures for Computer Science, Discrete Mathematics and its Applications, seventh edition