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_2: P_2(x_2) -> U(x_2). forall x_2: P_2(x_2). forall x_2: Q_1(x_2).
forall x_2: U(x_2) can be inferred via the universal modus ponens rule. forall x_2: P_2(x_2) and Q_1(x_2) can be inferred via the universal conjunction rule. forall x_2: Q_1(x_2) and P_2(x_2) can be inferred via the universal conjunction rule.