What should be noted when using the prop stand?

The selected combination is correct because all three points are crucial for safely using the prop stand on a motorbike.

1. Parking on a slope should be avoided to prevent the motorbike from rolling over, which can cause accidents or damage.
2. Ensuring the prop stand is fully extended is important for stability. An improperly extended stand may not support the weight of the bike, leading to a fall.
3. The prop stand switch plays a safety role by preventing the motorbike from being driven off with the stand still engaged, which can result in accidents and injuries.

Overall, these practices enhance safety and compliance with German traffic rules, which prioritize responsible riding and accident prevention.