Under Article 47 of the PRC Road Traffic Safety Law, what must a motor vehicle driver do when approaching a pedestrian crosswalk (斑马线) where pedestrians are crossing?

1. Honk continuously and accelerate to frighten pedestrians away
2. Slow down in advance, and come to a complete stop to yield right-of-way to pedestrians crossing the street (停车礼让行人)
3. Weave between crossing pedestrians at high speed
4. Flash high-beam headlights to demand pedestrians retreat