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A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called___________

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A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called___________

(a) a crystal oscillator

(b) a voltage-controlled oscillator

(c) an astable multivibrator

(d) a Hartley oscillator

I have been asked this question in an interview.

Query is from Oscillators topic in chapter Power Amplifiers of Electronic Devices & Circuits

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The correct choice is (b) a voltage-controlled oscillator

The best I can explain: A Voltage controlled oscillator is an oscillator with an output signal whose output can be varied over a range, which is controlled by the input DC voltage. It is an oscillator whose output frequency is directly related to the voltage at its input.

The oscillation frequency varies from few hertz to hundreds of GHz.

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