Concerning the NAVSTAR/GPS satellite navigation system, what is the meaning of the term 'Receiver Autonomous Integrity monitoring' (RAIM)?1) It is a technique by which a receiver ensures the integrity of the navigation information2) It is the ability of the GPS satellites to check the integrity of the data transmitted by the monitoring stations of the ground segment3) It is a method whereby a receiver ensures the integrity of the Pseudo Random Noise (PRN) code transmitted by the satellites4) It is a technique whereby receivers of the world-wide distributed monitor stations (ground segment) automatically determines the integrity of the navigation message

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