What is the rule regarding yielding right-of-way when a minor road joins a major road?

1. Vehicles on the major road must yield to vehicles merging from the minor road.
2. Vehicles on the minor road must yield right-of-way to traffic on the major road.
3. Vehicles should merge in turn (zipper merge) with no one yielding.
4. Right-of-way is determined by which vehicle is traveling faster.