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 z_1: Q(z_1) -> R(z_1). forall z_1: T_2(z_1) or Q(z_1). forall z_1: T_2(z_1) -> R(z_1). forall z_1: R(z_1) -> Q(z_1).
forall z_1: T_2(z_1) -> Q(z_1) can be inferred via the universal transitivity rule. forall z_1: R(z_1) can be inferred via the universal disjunction elimination rule. forall z_1: Q(z_1) <-> R(z_1) can be inferred via the universal biconditional introduction rule. forall z_1: R(z_1) <-> Q(z_1) can be inferred via the universal biconditional introduction rule.