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_2: ~U(y_2). forall y_2: Q_3(y_2) -> U(y_2). forall y_2: W(y_2) <-> Q_3(y_2).
forall y_2: ~Q_3(y_2) can be inferred via the universal modus tollens rule. forall y_2: W(y_2) -> Q_3(y_2) can be inferred via the universal biconditional elimination rule. forall y_2: Q_3(y_2) -> W(y_2) can be inferred via the universal biconditional elimination rule.