Which of the following is NOT a uniform don't?

A plain band ring is considered an acceptable form of jewelry in many uniform policies because it does not interfere with food safety or personal hygiene standards. Unlike wrist jewelry, long painted or artificial nails, and hair that comes out of the cap, a plain band ring is less likely to harbor bacteria or cause a safety issue while handling food. This makes it a reasonable choice for individuals working in environments that require adherence to strict cleanliness and safety protocols.

On the other hand, wrist jewelry can trap food particles or bacteria, whereas long nails can be difficult to keep clean and might pose a risk of breaking or scratching. Hair that comes out of the cap can also pose a contamination risk in food preparation areas. Therefore, a plain band ring is compliant with uniform standards in these settings, making it the correct answer in this context.