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 y_3: W(y_3) -> Q(y_3). forall y_3: W(y_3) -> Q(y_3). exists y_3: Q(y_3) -> W(y_3).
exists y_3: Q(y_3) <-> W(y_3) can be inferred via the existential biconditional introduction rule. exists y_3: Q(y_3) <-> W(y_3) can be inferred via the existential biconditional introduction rule. exists y_3: W(y_3) <-> Q(y_3) can be inferred via the existential biconditional introduction rule. exists y_3: W(y_3) <-> Q(y_3) can be inferred via the existential biconditional introduction rule.