Under Article 48 of the Road Traffic Safety Law Implementation Regulations, what headlight operation is required when meeting an oncoming vehicle at night (夜间会车) on an unlit road?

1. Switch from high beam (远光灯) to low beam (近光灯) at least 150 meters before reaching the oncoming vehicle, and reduce speed
2. Keep high beams on continuously to illuminate the oncoming driver's cabin clearly
3. Turn off all vehicle lights completely to avoid blinding the oncoming vehicle
4. Activate hazard warning flashers and accelerate past the oncoming vehicle