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Which of the following is used to vary the frequency of the carrier frequency in accordance with the baseband signal amplitude variations in direct method of FM generation?

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Which of the following is used to vary the frequency of the carrier frequency in accordance with the baseband signal amplitude variations in direct method of FM generation?

(a) Integrator

(b) Envelope detector

(c) Multivibrator

(d) Voltage controlled oscillators

I got this question at a job interview.

The doubt is from Angle modulation topic in portion Modulation Techniques for Mobile Radio of Wireless/Mobile

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Right answer is (d) Voltage controlled oscillators

The explanation: In direct method, VCOs are used to vary the frequency of the carrier signal in accordance with the baseband signal amplitude variations. These oscillators use devices with reactance that can be varied by the application of a voltage.

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