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: exists z: ~Q(z). forall z: T_4(z) -> Q(z). forall z: Q(z) -> T_4(z). forall z: Q(z) or ~T_4(z).
exists z: ~T_4(z) can be inferred via the existential modus tollens rule. forall z: T_4(z) -> Q(z) can be inferred via the universal rewriting rule. forall z: T_4(z) <-> Q(z) can be inferred via the universal biconditional introduction rule. forall z: Q(z) <-> T_4(z) can be inferred via the universal biconditional introduction rule.