Downlink refers to data transmitted from the unmanned aircraft to the ground control station.

• A. DOWNLINK
• B. UPLINK
• C. CROSSLINK
• D. MIDLINK

Answer: (A)

Data flow direction determines the terminology: data moving from the drone to the ground control station is called the downlink. This path carries telemetry, live video, and sensor data back to the operator so they can monitor the aircraft and its status. The opposite direction—data sent from the ground control station to the drone—is known as the uplink, which carries control commands and configuration data. The other terms aren’t standard for UAV communications in this sense; crosslink would imply aircraft-to-aircraft or similar inter-air connections, and midlink isn’t a recognized term for the drone-ground path. So the data transmitted from the unmanned aircraft to the ground control station is downlink.