Question id 23 - VFR Communications - ATPL - Airline Transport Pilot license

A station in the aeronautical mobile service located on land or, in certain instances, on board of a ship or on a platform at sea
An airborne station forming part of the aeronautical fixed telecommunication network (AFTN)
A station in the aeronautical telecommunication service located on land or on board of an aircraft to exchange radiotelephony communications
Any station established to exchange radiotelephony communications

Training tests and timed exam simulations ATPL - Airline Transport Pilot license