Final answer:
The server should politely decline to serve alcohol and inform management, citing the legality and policy regarding fake IDs, while maintaining professionalism and courtesy.
Step-by-step explanation:
A server who is presented with a fake ID should respond by politely declining to serve alcohol to the guest. Expressing that it is against the law and the establishment's policies to accept an invalid ID is essential. Additionally, the server should inform management about the incident to handle the situation appropriately.
In this scenario, the server must remain professional and courteous while explaining the seriousness of the issue. Compliance with legal requirements protects both the establishment and the server from potential legal consequences. The interaction should be discreet to avoid public embarrassment for the guest while maintaining a firm stance against serving alcohol to minors.