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: T_3(z) -> W_2(z). exists z: T_3(z) <-> T(z). forall z: ~W_2(z). forall z: W_2(z) -> T_3(z).
forall z: ~T_3(z) can be inferred via the universal modus tollens rule. forall z: T_3(z) <-> W_2(z) can be inferred via the universal biconditional introduction rule. forall z: W_2(z) <-> T_3(z) can be inferred via the universal biconditional introduction rule. exists z: T_3(z) -> T(z) can be inferred via the existential biconditional elimination rule. exists z: T(z) -> T_3(z) can be inferred via the existential biconditional elimination rule.