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_3: Q_3(x_3). forall x_3: T(x_3) -> Q(x_3). forall x_3: Q(x_3) -> T(x_3). forall x_3: Q(x_3) -> ~Q_3(x_3).
forall x_3: ~Q(x_3) can be inferred via the universal modus tollens rule. forall x_3: T(x_3) <-> Q(x_3) can be inferred via the universal biconditional introduction rule. forall x_3: Q(x_3) <-> T(x_3) can be inferred via the universal biconditional introduction rule.