A.
No licensee and no employee or agent of a licensee shall sell, serve or deliver any alcoholic beverage to a person under the age of 21 years; nor shall a licensee allow, permit or suffer the sale, service or delivery to or consumption of alcoholic beverages by any such person upon the licensed premises.
B.
If a licensee's employee or agent, authorized to sell, serve or deliver alcoholic beverages, shall sell, serve or deliver such beverages in violation of this section, the sale, service or delivery shall be deemed the act of the licensee, as well as that of the employee or agent, and the licensee as well as the employee or agent shall be guilty of a violation of this article.