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: W_4(z) or Q_2(z). forall z: U_4(z) -> Q_2(z). forall z: W_4(z) -> U_4(z). forall z: Q_2(z) -> U_4(z).
forall z: W_4(z) -> Q_2(z) can be inferred via the universal transitivity rule. forall z: U_4(z) can be inferred via the universal disjunction elimination rule. forall z: U_4(z) <-> Q_2(z) can be inferred via the universal biconditional introduction rule. forall z: Q_2(z) <-> U_4(z) can be inferred via the universal biconditional introduction rule.