Which of the following is a requirement for a valid school bus driver's license?

A valid school bus driver's license specifically requires a valid driver's license that includes a school bus endorsement. This endorsement signifies that the driver has received specialized training and has met additional testing requirements to safely operate a school bus, which may include knowledge of the unique rules and responsibilities associated with transporting students.

On the other hand, a motorcycle endorsement, although valid for operating motorcycles, does not provide the necessary qualifications to drive a school bus. A learner's permit may allow individuals to practice driving under specific conditions but does not meet the criteria for a full school bus driver's license. A regular valid driver's license without the school bus endorsement lacks the necessary training and certification required for operating a school bus, hence cannot be considered valid for that purpose. Therefore, having a valid driver's license accompanied by a school bus endorsement ensures that a driver possesses both the legal authority and the required skills to safely transport students.