Final answer:
A server can verify a guest's age by asking for identification to ensure they are 21 years old.
Explanation:
To determine if a guest is 21, a server can ask for identification such as a driver's license or a passport.
By checking the date of birth on the identification, the server can confirm if the guest is of legal drinking age.
It is crucial for servers to verify the age of guests to comply with alcohol laws and regulations.
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