Under Indiana law, which practice is legal while towing a person behind a PWC?
Options:
1. Towing a person on water skis who is wearing a ski belt
2. Towing a person behind a PWC that is seven feet in length
3. Towing a person with an observer on board to observe the towed person at all times
4. Towing a person on water skis after sunset with red and blue flashing lights