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A
One-way communication from stations or locations on the surface of the earth.
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B
Two-way communication between aircraft and stations or locations on the surface of the earth.
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C
One-way communication from aircraft to stations or locations on the surface of the earth.
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D
A method in which telecommunications between two stations can take place in both directions simultaneously.
ICAO Annex 10
1.3 Communication Methods
Air-ground communication. Two-way communication between aircraft and stations or locations on the surface of the Earth.
Air-to-ground communication. One-way communication from aircraft to stations or locations on the surface of the Earth.
Note: Be careful with this question. The only difference is "to". If "to" => One-way. If not => Two-way.
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