(a) Cigarettes that are certified by a manufacturer in accordance with section four of this article shall be marked to indicate compliance with the requirements of section three of this article. The marking shall be in eight-point type or larger and consist of:
(1) Modification of the product UPC code to include a visible mark printed at or around the area of the UPC code. The mark may consist of alphanumeric or symbolic characters permanently stamped, engraved, embossed or printed in conjunction with the UPC;