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_4(z) -> ~W_4(z). forall z: U_4(z) <-> T(z). forall z: T(z) <-> W(z). forall z: W_4(z).
forall z: ~U_4(z) can be inferred via the universal modus tollens rule. forall z: U_4(z) -> T(z) can be inferred via the universal biconditional elimination rule. forall z: T(z) -> W(z) can be inferred via the universal biconditional elimination rule. forall z: T(z) -> U_4(z) can be inferred via the universal biconditional elimination rule. forall z: W(z) -> T(z) can be inferred via the universal biconditional elimination rule.