-  A radio navigation service using satellites for the purpose of self-training, intercommunication and technical studies carried out by amateurs

  -  A spacecraft launching service for amateur-built satellites

  -  A service using amateur stations on satellites for the purpose of self-training, intercommunication and technical investigations

  -  A radio communications service using stations on Earth satellites for weather information gathering

  

Correct Answer : A service using amateur stations on satellites for the purpose of self-training, intercommunication and technical investigations