What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: t or u. ~t. forall z: W_2(z) <-> P_1(z). ~W_2(h).
u can be inferred via the disjunctive syllogism rule. ~t and ~W_2(h) can be inferred via the conjunction rule. ~W_2(h) and ~t can be inferred via the conjunction rule. forall z: W_2(z) -> P_1(z) can be inferred via the universal biconditional elimination rule. forall z: P_1(z) -> W_2(z) can be inferred via the universal biconditional elimination rule.