How is priority determined at an intersection where an asphalt (paved) road intersects an unpaved (dirt/gravel) road without any traffic signs?

1. Both roads are equal and priority to the right applies.
2. The paved road (asphalt, concrete, stone) is the primary road, and vehicles on the unpaved dirt road must yield.
3. The unpaved road has priority because dirt roads are more difficult to stop on.
4. The vehicle with four-wheel drive has priority.