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_8: T_3(x_8) -> Q(x_8). forall x_8: Q(x_8) -> W_4(x_8). exists x_8: Q(x_8) -> T_3(x_8). forall x_8: ~W_4(x_8).
forall x_8: ~Q(x_8) can be inferred via the universal modus tollens rule. forall x_8: T_3(x_8) -> W_4(x_8) can be inferred via the universal transitivity rule. exists x_8: Q(x_8) <-> T_3(x_8) can be inferred via the existential biconditional introduction rule. exists x_8: T_3(x_8) <-> Q(x_8) can be inferred via the existential biconditional introduction rule.