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In which of the following type of scanning a heterodyne is used?

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In which of the following type of scanning a heterodyne is used?

(a) IF Scanning

(b) Frequency scanning

(c) Phase scanning

(d) Digital beam-forming

This question was posed to me during an interview.

My doubt is from Phased Array topic in portion Phased, Adaptive and Binomial Arrays of Antennas

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The correct choice is (a) IF Scanning

The explanation is: At receiving the signals received are heterodyned to IF (Intermediate frequency). The remaining methods of scanning like beam forming are applicable. In IF scanning the heterodyne is used. In frequency scanning the frequency is varied while in phase scanning the phase of the radiators is varied.

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