Which of the following are Tautologies I) ((a->b) ∧ (b->c)) -> (a->c) II) ((…

 Which of the following are Tautologies

I) ((a->b) ∧ (b->c)) -> (a->c)

II) (( a<->c) -> ~b ) ->(a∧c)

III) a-> (b->a)

  1. A.

    I is tautology

  2. B.

    II, III are tautologies

  3. C.

     I, II, III are tautologie

  4. D.

     I and III are tautology

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