According to the Colorado CDL Manual, which sections should a passenger endorsement applicant study for the passenger knowledge test?

1. Sections 2 and 4, plus Section 5 if the bus has air brakes
2. Only Section 1 because passenger vehicles are covered by CDL basics
3. Only Section 10 because buses and school buses are the same test
4. Sections 7 and 8 because passenger vehicles are treated like doubles and tankers