What is one requirement for staff 18 years and under in a restricted area?

In a restricted area, individuals who are 18 years old and under are subject to specific regulations regarding the serving of alcohol. The correct answer indicates that they cannot serve alcohol at all. This restriction is in place to ensure responsible alcohol service and compliance with legal regulations. Many jurisdictions enact these rules to promote safety and limit the exposure of minors to alcohol-related environments, recognizing that those under 18 may not have the maturity or legal standing to handle alcohol responsibly.

The other options suggest varying degrees of allowance for minors to be involved in alcohol service, which could lead to legal consequences for the establishment and potential harm to minors. Thus, restricted areas have strict policies that prohibit those 18 and under from serving alcohol entirely.