Where may you park here?

Your answer is correct because parking is allowed on both the left and right hard shoulders in this situation.

In German traffic rules, a hard shoulder (Pannenstreifen) is the area beside the main roadway, often paved and used for emergencies or sometimes for parking where indicated. If signs or markings do not restrict parking, and the shoulders are accessible and safe, parking on either side is permitted.

Here, since no specific sign prohibits parking on either shoulder, you may park on both the left-hand and right-hand hard shoulders. Remember, always check for signs or road markings that might restrict parking in such areas.