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What type of oscillators are used to input a wide range of frequencies to the IF amplifier?

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What type of oscillators are used to input a wide range of frequencies to the IF amplifier?

(a) LC oscillators

(b) Crystal oscillators

(c) Variable frequency oscillators

(d) Diode oscillators

The question was asked in an interview for internship.

My query is from Communication Receivers in division Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

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Correct option is (c) Variable frequency oscillators

Easy explanation: The local oscillator is usually a variable frequency oscillator or a frequency synthesizer so that its frequency can be adjusted over a relatively wide range. As the local-oscillator frequency is changed, the mixer translates a wide range of input frequencies to the fixed IF.

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