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: T_4(z) -> R_2(z). forall z: R(z). exists z: T_4(z).
exists z: R_2(z) can be inferred via the existential modus ponens rule. exists z: T_4(z) and R(z) can be inferred via the existential conjunction rule. exists z: R(z) and T_4(z) can be inferred via the existential conjunction rule.