Which function do the tanks NOT serve in Quadrant 4?

The correct answer identifies that providing office space is a function the tanks do not serve in Quadrant 4. In the context of fire service operations, especially regarding tank storage and distribution, tanks are used primarily for their intended purpose of holding liquids, such as propane.

The other options are integral functions associated with tank operations in a facility that deals with propane. Storing propane for distribution is a fundamental role of tanks, as they are designed to safely hold large volumes of gas before it is distributed. Filling smaller tanker trucks is another critical operation that tanks perform, allowing for the transportation of propane to various locations. Finally, unloading propane from rail tankers is also a key function, enabling the transfer of propane from rail transport to storage tanks.

In contrast, office space does not relate to the operational use of tanks within this context, emphasizing that tanks are solely for storage and not for administrative or office functions.