Which among the following propositions are tautologies?

1.~(A ≡ ~A)

2.A ≡ (B ∨ A)

3.A ⊃ (A ∨ B)

4.(B ⊃ A) ⊃ (A ⊃ B)

A1, 2

B2, 3

C1, 3

D3, 4

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