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The basic principle of operation of the ILS is the DDM between the 90Hz and 150Hz lobes.A DDM of zero indicates:1. the highertone lobe is received at a higher strength than the lower tone lobe2. the exact runway centreline3. the aircraft is on the glidepath4. a balance between modulationsa) 2, 3 and 4 b) 1, 2 and 4 c) 1 and 3 d) 2 and 3

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