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The basic principle of operation of the ILS is the difference in depth of modulation (DDM) between the two lobes:1. if the A/C strays right, the higher tone lobe will be received at a higher intensity than the lower tone lobe2. a DDM of zero indicates the exact runway centreline3. the depth of modulation increases away from the centreline4. a DDM of zero indicates a balance between modulations--Which statements are correct?a) 2 and 3 / b) 1 and 3 / c) 2, 3 and 4 / d) 1, 2, 3, and 4

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