A Tennessee mechanic test-drives school buses but does not transport students. What does Tennessee Driver Services say about the S endorsement?

1. School bus mechanics who do not transport students do not need the S endorsement, but they must have the P endorsement and a Class B license
2. Every mechanic must hold S even when no students are transported
3. A mechanic needs only a Class D license for all school buses
4. A mechanic needs only a motorcycle endorsement