What is the obligation of vehicle drivers who meet one another head-on on a narrow and level road?

1. ATo slow down and move their vehicle to the edge of the road and even beyond it, in order to prevent a collision.
2. BThey will act according to what is customary on that road.
3. CThe driver of the large vehicle will stop and allow the other vehicle to continue its journey on the narrow section.
4. DThe driver of the large vehicle will increase his speed and pass first on the narrow section.

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