According to CS25, a CVR (Cockpit Voice Recorder) must record: 

 1 - communications transmitted from or received in the aeroplane by radio 

 2 - communications of flight-crew members on the flight deck via the area microphone 

 3 - communications of flight-crew members on the flight deck using the aeroplane's interphone system 

4 - audio signals identifying navigation or approach aids introduced into a headset or speaker 

 The combination that regroups all of the correct statements is: