Which of the following statements about right-of-way at an unmarked T intersection is true?

1. Traffic on the road that ends at the T intersection has the right-of-way.
2. All traffic must stop and the driver who stopped first has the right-of-way.
3. All traffic must stop and the driver on the right has the right-of-way.
4. Traffic on the through-road has the right-of-way.