During a Texas doubles/triples walkaround, what should the driver verify about converter dolly air and electrical connections before moving?

1. The lines are disconnected until the vehicle reaches highway speed.
2. Only the electrical cable matters because the dolly has no air brakes.
3. Lines are connected, supported, not leaking or damaged, and have enough slack for turns.
4. The lines may drag on the deck if the glad hands are locked.