Where must you use a parking disc for parking?

When parking in Germany, a parking disc is required under specific circumstances to regulate parking durations and prevent overstaying in designated areas. You must use a parking disc at a defective parking meter, indicated by specific traffic signs denoting time-limited parking zones. This ensures that you are complying with local parking regulations, which are enforced to keep the flow of traffic and prevent congestion.

Parking discs are not to be used in no-waiting areas as parking is prohibited there altogether. The combination of the two correct answers ensures adherence to regulations meant to balance accessibility and order in parking practices.