According to regulations, DOT containers must comply with which code for design and fabrication?

The correct choice indicates that DOT containers, which are commonly used for transporting propane and other hazardous materials, must adhere to the Boiler and Pressure Vessel Code for their design and fabrication. This code provides specific safety standards for the construction and operation of pressure vessels and boilers, ensuring they can safely contain gases and liquids under pressure.

This compliance ensures that the containers are built with materials and methods that can withstand the internal pressures generated by the propane, preventing leaks and potential accidents. By adhering to this code, manufacturers demonstrate that the containers meet rigorous safety standards, thus protecting not only the users of the containers but also the broader public.

The other codes mentioned, while important in their respective domains, do not specifically address the requirements for pressure vessels and containers used for hazardous material transport, which is the primary concern in this context.