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: forall z_4: W(z_4) -> T_2(z_4). forall z_4: ~T_2(z_4). forall z_4: W(z_4) <-> T_2(z_4).
forall z_4: ~W(z_4) can be inferred via the universal modus tollens rule. forall z_4: W(z_4) -> T_2(z_4) can be inferred via the universal biconditional elimination rule. forall z_4: T_2(z_4) -> W(z_4) can be inferred via the universal biconditional elimination rule. forall z_4: ~W(z_4) can be inferred via the universal biconditional elimination rule.