A Maryland applicant wants a P endorsement on a bus with air brakes. Which testing plan is complete?

1. Passenger knowledge on Sections 2 and 4, air brakes knowledge on Section 5, and required skills testing in a representative passenger vehicle
2. Only the Passenger knowledge test because air brakes are part of every bus
3. Only the Air Brakes test because it covers stopping
4. Only a School Bus test because all buses are school buses