Which of the following is tautology...

Which of the following is tautology

A

`~(p vv ~q) rarr (p vv q)`

B

`(~p vv q) rarr (p vv q)`

C

`~(p ^^ ~q) rarr (p vv q)`

D

`~(p vv ~q) rarr (p ^^ q)`

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The correct Answer is:

A

NA

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