What is the right course of action?

Your answer is correct because in German traffic rules, when encountering a potential hazard such as a pedestrian standing near a parked vehicle on the roadside, it is important to take careful precautions to ensure safety.

Braking (option 1) reduces your speed and gives you more time to react if the pedestrian suddenly steps onto the road. This is vital, especially on a curve where visibility is reduced.

Moving as far to the right as possible (option 2) increases the distance between your vehicle and the hazard, reducing the risk of collision or endangering the pedestrian.

Remaining in the center of your lane (option 3) is less safe in this situation because it keeps you closer to the hazard and does not maximize lateral clearance.

In summary, German traffic rules emphasize adapting your driving to the situation by slowing down and creating as much safe lateral space as possible to protect vulnerable road users, especially in potentially dangerous scenarios around curves and obstacles.