Final answer:
The fruit salad prepared on Tuesday should be labeled with a use-by date of Friday or Saturday to adhere to food safety guidelines, recommending consumption within 3 to 4 days when refrigerated.
Step-by-step explanation:
The question concerns the proper labeling of food with regard to safety regulations and preventing foodborne illness. When a food worker prepares something like a fruit salad that isn't served on the same day, it needs to be labeled with a use-by date to ensure quality and safety. According to food safety guidelines, prepared foods should be consumed or discarded within 3 to 4 days when stored in the refrigerator at or below 40 degrees Fahrenheit. Therefore, if the fruit salad was prepared on Tuesday, the use-by date should be labeled as Friday or Saturday to follow these guidelines effectively.