What is a primary duty under "Know the Law" for a seller-server?

A primary duty under "Know the Law" for a seller-server is to prevent the sale of alcohol to minors. This responsibility is crucial as it is legally mandated to ensure that individuals under the legal drinking age are not served alcoholic beverages. By understanding and adhering to the laws regarding the service of alcohol, seller-servers play a key role in promoting public safety and welfare. This duty helps reduce the risks associated with underage drinking, such as health issues, accidents, and legal consequences for both the seller and the minor.

The other options may not align with safe or responsible alcohol service. For instance, preventing alcohol-related marketing and promoting the consumption of alcohol could be viewed as encouraging irresponsible behavior or promoting alcohol use in inappropriate contexts. Similarly, while giving discounts to regular customers could be considered part of marketing strategies, it does not relate to the core legal responsibilities of a seller-server regarding age verification and responsible service of alcohol.