Which of the following describes an occupancy that is secondary to the main occupancy and less than 10 percent of the area of the story on which it is located?

The correct answer is found in the definition of occupancy classifications within building codes. An "accessory" occupancy refers to a space or area that is subordinate to the main occupancy of a building and does not exceed 10 percent of the area of the story on which it is located. This means that the primary function of the building is defined by the main occupancy, while the accessory occupancy plays a supportive role without being dominant in character or space usage.

Accessory occupancies are typically included within the main structure and share egress and services, which allows for cohesive management of fire safety systems. The key point is that their size and area are limited in relation to the primary occupancy, which is critical for ensuring that the fire and building codes are appropriately adhered to, maintaining safety and compliance.

In contrast, other options may not accurately reflect the specific criteria related to occupancy classification based on area and function. Understanding the distinctions between these categories is essential for proper fire inspection and building safety compliance.