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: p_1. p_1 -> s. forall x_21: P_21(x_21) and Q_21(x_21).
s can be inferred via the modus ponens rule. forall x_21: P_21(x_21) can be inferred via the universal simplification rule. forall x_21: Q_21(x_21) can be inferred via the universal simplification rule.