What must a driver do when approaching a red octagonal traffic sign with the word 'STOP' in English and Arabic?

1. Slow down and proceed if no cross-traffic is visible within 50 meters
2. Come to a complete stop before the stop line and proceed only when clear and safe
3. Stop only if pedestrians or emergency vehicles are present at the crossing
4. Yield right-of-way while maintaining a slow rolling speed of under 10 km/h