In which scenario is a commercial driver's license not required for driving a school bus?

For driving a school bus, a commercial driver's license (CDL) is typically required due to the responsibilities and the potential risks involved in transporting students. However, there are specific circumstances under which a CDL is not necessary, and the correct option indicates that there is no scenario where a CDL is not required for driving a school bus.

A small bus or vehicle may not always require a CDL if it meets certain weight and capacity criteria, but when the vehicle is used for school purposes, it typically falls under regulations that mandate a CDL. Driving on private property might suggest that certain licensing requirements do not apply; however, since school buses are specifically designed for transporting students, the need for a CDL remains.

When supervising students without driving the vehicle, there is also no exemption from the requirement for someone else who is driving the school bus, as the rules primarily pertain to the operation of the vehicle itself and not just supervising minors. Therefore, for any scenario involving the operation of a school bus, the requirement for a CDL stands firm, affirming that there is indeed no scenario in which a CDL can be bypassed for school bus operation.