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: exists x_12: T_1(x_12). forall x_12: P_12(x_12) -> Q_12(x_12). forall x_12: P_12(x_12).
forall x_12: Q_12(x_12) can be inferred via the universal modus ponens rule. exists x_12: T_1(x_12) and P_12(x_12) can be inferred via the existential conjunction rule. exists x_12: P_12(x_12) and T_1(x_12) can be inferred via the existential conjunction rule.