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: T_3(z_2) -> W(z_2). exists z_2: W(z_2) -> T_3(z_2). forall z_2: W(z_2) -> T_3(z_2).
forall z_2: T_3(z_2) <-> W(z_2) can be inferred via the universal biconditional introduction rule. forall z_2: W(z_2) <-> T_3(z_2) can be inferred via the universal biconditional introduction rule. exists z_2: W(z_2) <-> T_3(z_2) can be inferred via the existential biconditional introduction rule. exists z_2: T_3(z_2) <-> W(z_2) can be inferred via the existential biconditional introduction rule.