What are PREVENTION TECHNIQUES essentially based on?

Question

Question EASA Drone Quiz - Flight performance and planning

QuizVDS · Accepted Answer

When the UAV is operating in close proximity to people, the remote pilot must keep it at a distance from them not less than the height

QuizVDS · Answer

Yes, always

QuizVDS · Answer

For every UAV in flight there must be a remote pilot

QuizVDS · Answer

For each remote pilot there must be an observer

Id 253 - EASA Drone Quiz – Drone Pilot Certification - What are PREVENTION TECHNIQUES essentially based on?