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_10: Q_10(x_10). exists x_10: P_3(x_10). forall x_10: P_3(x_10) -> U(x_10).
exists x_10: U(x_10) can be inferred via the existential modus ponens rule. exists x_10: P_3(x_10) and Q_10(x_10) can be inferred via the existential conjunction rule. exists x_10: Q_10(x_10) and P_3(x_10) can be inferred via the existential conjunction rule.