When approaching a zebra crossing (paso de cebra / paso peatonal) where a pedestrian has stepped onto or is about to step onto the crosswalk, what is the driver's legal duty?

1. Sound the horn and accelerate to clear the crosswalk before the pedestrian
2. Yield right-of-way, stopping completely before the stop line to allow the pedestrian to cross safely
3. Flash high beams to instruct the pedestrian to hurry
4. Maintain speed because vehicles always have priority over pedestrians on avenues