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Which statement is true about an SCA signal?

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Which statement is true about an SCA signal?

(a) it can use amplitude modulation

(b) it can use frequency modulation

(c) is monaural

(d) it can use amplitude as well as frequency modulation and is also monaural

I got this question in an interview for job.

My doubt stems from Non Linear Device topic in portion Side Band Techniques of Analog Communications

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The correct choice is (d) it can use amplitude as well as frequency modulation and is also monaural

The best explanation: STC stands for Subsidiary Communication Authority. SCA is a separated data channel which is transmitted along with the main signal over a broadcast station. It can either be amplitude modulated or frequency modulated. It being monaural means that multiples audio signals are mixed and then passed through a single channel.

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