What is the absolute legal rule when a pedestrian has entered or clearly indicates an intention to enter a marked zebra crossing?

1. Drivers must yield right-of-way and come to a stop before the crossing to let the pedestrian cross safely
2. Drivers may sound their horn and accelerate if the pedestrian has not reached their lane yet
3. Pedestrians must always wait until all motor vehicles have completely cleared the road
4. Drivers are only required to stop for pedestrians between 08:00 and 18:00