Determine the validity of the logical equivalence: ¬(P∧Q)≡¬P∨¬Q\neg(P \land Q) \equiv \neg P \lor \neg Q¬(P∧Q)≡¬P∨¬Q.
Invalid
Valid by De Morgan's Law
Valid only if PPP and QQQ are false
Valid only if PPP and QQQ are true