What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_2: S(x_2) -> Q(x_2). exists x_2: Q(x_2) -> S(x_2). forall x_2: ~S(x_2).
exists x_2: ~Q(x_2). exists x_2: Q(x_2) <-> S(x_2). exists x_2: S(x_2) <-> Q(x_2).