Let \( p, q \) and \( r \) be any three logical statements. Which of the following is true? (a) ...

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Let \( p, q \) and \( r \) be any three logical statements. Which of the following is true?
(a) \( \sim[p \wedge(\sim q)] \equiv(\sim p) \wedge q \)
(b) \( \sim[(p \vee q) \wedge(\sim r) \equiv(\sim p) \vee(\sim q) \vee(\sim r) \)
(c) \( \sim[p \vee(\sim q)] \equiv(\sim p) \wedge q \)
(d) \( \sim[p \vee(\sim q)] \equiv(\sim p) \wedge \sim q \)
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