Where must you wait?

You answered correctly. When approaching a stop sign with a marked stop line, German traffic law requires you to stop exactly at the stop line before entering the intersection—regardless of your visibility. You must wait there and only move forward if you cannot see the cross street from that position. In this situation, since there is a visible stop line, you have to stop and wait at that line. This rule ensures traffic safety and clear right-of-way regulation at intersections. Remember: always stop at the stop line first when a stop sign is present.