Question id 329 - Radio Navigation - ATPL - Airline Transport Pilot license

Is receiving the signals of all visible satellites but tracking only those of the 4 with the best geometric coverage
Is receiving and tracking the signals of all 24 operational satellites simultaneously
Is tracking more than the required 4 satellites and can instantly replace any lost signal with another already being monitored
The aircraft's receiver measuring the phase angle of signals received from a number of satellites in known positions