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Which of the following is used to detect the modulated reflected light from any irregularity on the surface?

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Which of the following is used to detect the modulated reflected light from any irregularity on the surface?

(a) Television camera

(b) Light intensity sensor

(c) Modulator

(d) Video processor

This question was addressed to me in an online interview.

My doubt is from Computers in Metrology in section Measuring Machines & Total Quality Management of Engineering Metrology

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Right answer is (d) Video processor

The best I can explain: When the light beam hits the material then any surface irregularity modulates the reflected light. This is detected by a video processor and also microcomputer in an evaluation unit.

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