(a) Beginning July 1, 1998, all persons licensed to sell alcoholic liquor, wine or nonintoxicating beer at retail, either for consumption on-premises or off-premises, or both, shall display signs provided by the Alcohol Beverage Control Commissioner warning of the possible danger of birth defects which may result from the consumption of alcohol during pregnancy. These signs shall be displayed upon the licensed premises in the following manner:
(1) If a licensee holds a license providing for the retail sale of alcoholic liquor, wine or nonintoxicating beer for on-premises consumption, the sign shall be posted in an open and prominent place in the licensed portion of the establishment: Provided, That self-service "mini-bars" in hotel guest rooms are exempt: Provided, however, That airports, convention centers, sports facilities and other licensed premises with more than one authorized location of sales, service and consumption shall post signs in plain view to the majority of patrons entering or approaching the licensed portion of the premises.