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What is the change in the observed frequency called?

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What is the change in the observed frequency called?

(a) Doppler shift

(b) Differential frequency

(c) Delta frequency

(d) Delta shift

I have been asked this question in final exam.

My query is from Doppler Radar in section Celestial Navigation, Doppler and Altimeter Radars of Avionics

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The correct option is (a) Doppler shift

Explanation: In Doppler radar, there is a change in reflected frequency when there is relative motion between the transmitter and the receiver. This change in frequency is called the Doppler shift and is proportional to the relative speed between the transmitter and receiver.

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