Which of the following is true ?...

Which of the following is true ?

A

`~p (p hArr q) -= [~(p rArr q) vee ~ (q rArr p)]`

B

`p rArr q -= ~p rArr ~q`

C

`~(p rArr -q) -= ~p wedge q`

D

`~(~p rArr ~q) -= ~p wedge q`

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