Let p, q and r be statements. Here "-" means "negation"; "" means "is equivalent"; "=" means "implies". Which of the following are tautologies? Select one or more: O a. (pAq) q O b. (pq) (-pV-q) O c. pV(-q) O d. (p=q)(-p=¬4) O e. (-p q)p O f. q V-g O g. (-p)=q) + p O h. (p=q) (-q=¬p) O i. (pA(p=q))= q O j. pVq V(¬r)

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