Which of the following, if any, is a prerequisite if a receiver of a NAVSTAR/GPS satellite navigation system is to be used in combination with a multi-sensor system?1) The prescribed IFR-equipment must be installed and operational2) The prescribed IFR-equipment must be working correctly and the navigation information continuously displayed3) The RAIM-function of the GPS receiver must be able to monitor all prescribed navigation systems4) Multi-sensor systems are not certificated for flights under IFR conditions

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