What should be noted when changing a tyre using a car jack?

Your selected combination is correct because both points 1 and 2 are essential for safely changing a tyre using a car jack.

According to German traffic safety regulations, using a car jack at the specified positioning points is crucial to ensure that the vehicle remains stable and does not slip or tip over. Point 1 emphasizes this by stating that the jack should be applied only at the manufacturer's designated points.

Point 2 highlights the importance of a stable and skid-resistant ground surface, which is vital for maintaining the vehicle's stability when lifted. If the ground is unstable, there is a significant risk of the vehicle falling, which can lead to serious accidents or injuries.

Point 3, while it may seem relevant, is not necessary because placing the jack at the mid-point of the vehicle's length is not a requirement. Instead, utilizing the correct specified points is what ensures safety during the tyre-changing process. Always follow the manufacturer’s guidelines for the safest outcome.