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What instrument measures the velocity by Doppler shift from backscatter of aerosol particles?

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What instrument measures the velocity by Doppler shift from backscatter of aerosol particles?

(a) Rotating anemometer

(b) Doppler radar

(c) Laser velocimeter

(d) Laser pitot tube

The question was asked in semester exam.

I'm obligated to ask this question of Helicopter, Optical and Hyper Sonic Air Data topic in chapter Air Data Systems, Altitude and Heading Reference of Avionics

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Right option is (c) Laser velocimeter

Explanation: In a laser velocitimeter, optical sensors are located within the aircraft and look out through the flow into the free stream. They measure the Doppler shift from backscatter of naturally occurring aerosol particles in the free stream.

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