Final answer:
Flatware should be stored with handles up to avoid contamination. Other items listed are properly stored.
Step-by-step explanation:
The item which has not been stored properly according to best practices for food safety is C. Flatware stored with the handles down.
In a commercial kitchen setting, flatware should be stored with the handles up to ensure that staff only touch the handles and not the parts of the flatware that come into contact with food.
This prevents contamination and helps maintain a hygienic environment.
The rest of the items listed, A. Tableware stored 6" off the floor, B. Glasses stored upside down, and D. Utensils covered for protection, are all examples of proper storage methods that help prevent contamination and ensure food safety.