Doubt from Communication

Theory related to this question

The peak dotted curve represents the m(t) curve and the curve in between (solid line curve) represents the c(t) curve

@Abhishek_2020_5 please help in this question.
Sorry @Shwetanshu_2018 but i can't get you

I hope you are aware about these facts and if not , then this is all you need to know about this topic to solve this question

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Thanks , I was knowing about this.

Option D

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