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_2: S(z_2) or W(z_2). forall z_2: S(z_2) <-> U(z_2). forall z_2: ~U(z_2).
forall z_2: S(z_2) -> U(z_2) can be inferred via the universal biconditional elimination rule. forall z_2: U(z_2) -> S(z_2) can be inferred via the universal biconditional elimination rule. forall z_2: ~S(z_2) can be inferred via the universal biconditional elimination rule.