Which of the following is true for any t...

Which of the following is true for any two statements p and q?

A

`~[p vv (-q)] = (~p) ^^ q`

B

`(p vv q) vv (-q)` is a tautology

C

`(p ^^ q) ^^ (~ q)` is a contradiction

D

`~[p ^^ (~p)]` is a tarutology

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