Which one of the following Boolean expre...

Which one of the following Boolean expressions is a tautology?

A

`(p vee q) wedge (p vee ~q)`

B

`(p vee q) wedge (~p vee ~q)`

C

`(p wedge q) vee (p wedge ~q)`

D

`(p vee q) vee (p vee ~q)`

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The correct Answer is:

D

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