What should be noted regarding the desired protective effect of airbags?

The selected combination of answers is correct because both points address crucial factors that ensure the effectiveness of airbags in vehicles.

1. Airbags can only achieve their full effect if passengers are seated correctly because the deployment of the airbag is designed to protect occupants who are in an optimal position. This means sitting with the seatbelt properly fastened and at a safe distance from the airbag itself.

2. The airbag deployment zone must not be encroached upon to ensure that the airbag can fully inflate and deploy as intended during a collision. Any obstruction in this zone can hinder the airbag's ability to protect the occupant effectively.

These points align with safety regulations within German traffic laws, emphasizing proper seat positioning and the importance of not obstructing airbag deployment zones for maximum safety in the event of an accident.

The third option, which states that airbags can replace seatbelts, is incorrect. Seatbelts remain a vital safety feature and should always be worn, regardless of airbag presence, as they significantly reduce the risk of injury during a crash. Therefore, ensuring that all relevant options are recognized helps reinforce the overall safety message.