Question: How do ground-based observation devices contribute to the control of UAVs in a scenario where a UAV control center operates a UAV using 3GPP communication?
Option 1: They transmit flight commands to the UAV.
Option 2: They report the location and identity of detected UAVs to the UAV control center.
Option 3: They provide video images of the UAV's surroundings.
Option 4: They establish direct device connections with other UAVs.
Explanation: Ground-based observation devices play a crucial role in enhancing the control of UAVs by reporting the location and identity of detected UAVs to the UAV control center. This information assists the control center in managing the UAV's flight and avoiding collisions, thereby ensuring safe and efficient operation.