Which of the following is always true?

1.	Which of the following is always true?
A.	\[(\tilde{\ }p\vee \tilde{\ }q)\equiv (p\wedge q)\]
B.	\[(p\to q)\equiv (\tilde{\ }q\to \tilde{\ }p)\]
C.	\[\tilde{\ }(p\to \tilde{\ }q)\equiv (p\wedge \tilde{\ }q)\]
D.	\[\tilde{\ }(p\leftrightarrow q)\equiv (p\to q)\to (q\to p)\]
Answer» C. \[\tilde{\ }(p\to \tilde{\ }q)\equiv (p\wedge \tilde{\ }q)\]

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Which of the following is always true?

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