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What is the instrument that is used to represent the frequency domain of the signal?

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What is the instrument that is used to represent the frequency domain of the signal?

(a) Frequency indicator

(b) Amplitude indicator

(c) Spectrum analyzer

(d) Oscilloscope

The question was asked during an internship interview.

The doubt is from Sidebands and Frequency Domain in division Amplitude & Frequency Modulation of Avionics

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Correct choice is (c) Spectrum analyzer

Best explanation: For waveform made up of signals with different frequencies, there is a wide range of sideband frequencies produced. To fully understand the signal a frequency domain display is used. An instrument known as the spectrum analyzer is used to display the frequency domain information of the signal whereas the amplitude information can be given by an oscilloscope.

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