Stop! (Hand held road sign).Stop as long as the sign is held up

What is the meaning of the following traffic sign?

1. Stop and give right-of-way to traffic on the road that crosses ahead.
2. Stop for a moment and then continue driving.
3. Give right-of-way to traffic on the road that crosses ahead while road-works take place.
4. Correct answer: Stop! (Hand held road sign).Stop as long as the sign is held up.