What should a tractor driver do when he obstructs the traffic behind him on a road?

1. Drive on the right lane of the road,only
2. Correct answer: Drive on the right side of the road and even on the hard shoulder if it is required and safe
3. He is permitted to drive on the left lane or on the right hard shoulder only.
4. Always drive on the hard shoulder.

WhyIf a tractor is holding up traffic behind it, it keeps to the right edge and moves onto the shoulder if needed and possible.