\[(p\wedge \tilde{\ }q)\wedge (\tilde{\ }p\vee ~q)\]is

1.	\[(p\wedge \tilde{\ }q)\wedge (\tilde{\ }p\vee ~q)\]is
A.	a contradiction
B.	a tautology
C.	either [a] or [b]
D.	neither [a] nor [b]
Answer» B. a tautology

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\[(p\wedge \tilde{\ }q)\wedge (\tilde{\ }p\vee ~q)\]is

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