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Device that causes the magnitude of pressure to change when the aircraft speed nears zero are called ______

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Device that causes the magnitude of pressure to change when the aircraft speed nears zero are called ______

(a) Airspeed indicator

(b) Low speed indicators

(c) Stall indicators

(d) Rotating anemometer

This question was addressed to me in my homework.

I would like to ask this question from Helicopter, Optical and Hyper Sonic Air Data topic in chapter Air Data Systems, Altitude and Heading Reference of Avionics

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Correct answer is (d) Rotating anemometer

The best I can explain: Rotating anemometer increases the magnitude of pressure change caused by the change in airspeed when the aircraft airspeed is near zero. They are used in low omni range airspeed systems for helicopters.

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