E1D03

What is a space telecommand station?

1. AAn amateur station located on the surface of the Earth for communication with other Earth stations by means of Earth satellites
2. BAn amateur station that transmits communications to initiate, modify, or terminate functions of a space station
3. CAn amateur station located in a satellite or a balloon more than 50 kilometers above the surface of the Earth
4. DAn amateur station that receives telemetry from a satellite or balloon more than 50 kilometers above the surface of the Earth

Pick an answer to check it.