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Which of the following is the most generally used term for comparing amplifier noise characteristics?

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Which of the following is the most generally used term for comparing amplifier noise characteristics?

(a) signal to noise ratio

(b) equivalent noise

(c) noise factor

(d) figure of merit

This question was addressed to me in an interview.

The above asked question is from Noise for DSB-SC topic in section Noise of Analog Communications

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The correct choice is (c) noise factor

For explanation: Noise factor measures degradation of signal to noise ratio which is caused by components in radio frequency (RF) signal chain. It is a number by which the performance of an amplifier can be specified, with lower values indicating better performance.

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