Final answer:
Hot food being transported off-premises for catering or delivery must be stored in insulated containers and maintained at or below 4°C to ensure food safety.
Step-by-step explanation:
Hot food being transported off-premises for catering or delivery must be stored in insulated containers to maintain its temperature. The correct answer is d) stored in insulated containers. This is important to prevent the growth of bacteria that can cause foodborne illnesses. Perishable foods should be kept at or below 4°C (40°F) to inhibit bacterial growth and ensure food safety.