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Which device is used for tuning the receiver according to incoming signal (especially in TV)?

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Which device is used for tuning the receiver according to incoming signal (especially in TV)?

(a) Low pass filter

(b) High pass filter

(c) Zener diode

(d) Varacter diode

I had been asked this question in exam.

My question is taken from Source of Information in chapter Elements of Communication System of Analog Communications

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Best answer
Correct choice is (d) Varacter diode

The best I can explain: Varactor diode is a diode working in the reverse-bias because of which no current flows through it. It has variable capacitance which varies with applied voltage. Varactor diodes are mainly used in Voltage Controlled Oscillators (VCOs) and RF Filters for tuning the receiver to the incoming signal or different stations.

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