A telecommunications carrier that offers both noncompetitive and competitive services shall offer all noncompetitive services, together with each applicable optional feature or functionality, subject to resale; however, the Commission may determine under Article IX of this Act that certain noncompetitive services, together with each applicable optional feature or functionality, that are offered to residence customers under different rates, charges, terms, or conditions than to other customers should not be subject to resale under the rates, charges, terms, or conditions available only to residence customers.