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 x_6: P_6(x_6). forall x_6: P_6(x_6) -> P_2(x_6). forall x_6: S(x_6).
forall x_6: P_2(x_6) can be inferred via the universal modus ponens rule. forall x_6: P_6(x_6) and S(x_6) can be inferred via the universal conjunction rule. forall x_6: S(x_6) and P_6(x_6) can be inferred via the universal conjunction rule.