Drone exam · Ground-risk mitigation Safety Does a perimeter fence physically contain a drone? Select one answer A Usually no; it may control people but the flight buffer still has to cover aircraft reach. B Yes, every fence stops a flyaway. C Only if painted red. D It guarantees RTH. Check answer Correct answer: A. Usually no; it may control people but the flight buffer still has to cover aircraft reach. People control and aircraft containment functions are different.