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: U(z) or U_4(z). forall z: ~T_3(z). forall z: T_3(z) <-> U_4(z). forall z: ~U(z) or P(z).
forall z: U_4(z) or P(z) can be inferred via the universal resolution rule. forall z: T_3(z) -> U_4(z) can be inferred via the universal biconditional elimination rule. forall z: U_4(z) -> T_3(z) can be inferred via the universal biconditional elimination rule. forall z: ~U_4(z) can be inferred via the universal biconditional elimination rule.