Which of the following Boolean expressio...

Which of the following Boolean expressions is not a tautology ?

A

`(p rArr q) vv (~ q rArr p)`

B

`(q rArr p) vv (~q rArr p)`

C

`(p rArr ~q) vv (~q rArr p)`

D

`(~ p rArr q) vv (~ q rArr p)`

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