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: Q(x_2) -> R(x_2). forall x_2: ~P_2(x_2) or R_3(x_2). forall x_2: R_3(x_2) -> R(x_2). exists x_2: P_2(x_2) or Q(x_2).
exists x_2: Q(x_2) or R_3(x_2) can be inferred via the existential resolution rule.