Final answer:
Class A and Class B driver licenses are required to operate a school bus, with Class B being the most commonly associated with school buses due to their weight and design for carrying multiple passengers.
Step-by-step explanation:
The classes of driver licenses that allow an individual to operate a school bus are Class A and Class B. Class A licenses typically cover vehicles with a gross combination weight rating (GCWR) of 26,001 or more pounds, where the towed vehicle is heavier than 10,000 pounds. A Class B license is for a single vehicle with a GCWR of 26,001 or more pounds, or a vehicle towing a vehicle not heavier than 10,000 pounds. School buses usually fall into the Class B category, as they are heavy vehicles designed to carry multiple passengers, although specifics can vary by state or country.