Which combination of passenger-bus railroad actions is fully consistent with Ohio Section 4?

1. Stop 15 to 50 feet before the crossing, look and listen both ways, open the forward door if it helps, and do not shift gears on the tracks in a manual bus
2. Stop 5 feet before the crossing, keep all doors closed even if hearing is blocked, and shift while crossing
3. Stop only after the front wheels reach the first rail, then listen
4. Proceed without slowing whenever no train horn is heard