What is the right course of action?

Your answer is fully correct because each of the selected actions follows the German traffic rules in this situation:

1. You must give way to the cyclist because they have the right of way when crossing.
2. You must also give way to the bus, as it is approaching from a priority road or does not have a stop sign.
3. You must come to a complete stop at the stop line because the stop sign legally requires this, ensuring safety and allowing you to check for other traffic.

Together, these rules ensure that you safely yield to all priority traffic and stop properly before proceeding at the intersection. This helps avoid accidents and respects the right of way regulations in Germany.