What is allowed at this traffic sign?

This sign means “no parking” (restricted stopping zone). You chose the correct answers.

You are still allowed to stop briefly, but only for a purpose: letting someone get in or out, or loading/unloading. That is considered stopping, not parking, as long as it is done without unnecessary delay.

You are also allowed to “wait” for up to 3 minutes. In German theory, waiting longer than 3 minutes counts as parking even if you stay in the vehicle. So the rule of thumb is: with this sign, max 3 minutes if you’re just waiting; longer only if you are actively loading/unloading or boarding/alighting the whole time.

Parking with a parking disc is not allowed here, because the sign prohibits parking regardless of a disc unless an additional sign explicitly permits it.