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(z) <-> R_3(z). exists z: R_3(z) <-> W(z).
forall z: W(z) -> R_3(z) can be inferred via the universal biconditional elimination rule. exists z: R_3(z) -> W(z) can be inferred via the existential biconditional elimination rule. forall z: R_3(z) -> W(z) can be inferred via the universal biconditional elimination rule. exists z: W(z) -> R_3(z) can be inferred via the existential biconditional elimination rule.