What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_2: T(z_2). forall z_2: R_4(z_2) -> T(z_2). exists z_2: T(z_2) -> R_4(z_2).
exists z_2: R_4(z_2). exists z_2: T(z_2) <-> R_4(z_2). exists z_2: R_4(z_2) <-> T(z_2).