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Which one of the following noise becomes of great importance at high frequencies?

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Which one of the following noise becomes of great importance at high frequencies?

(a) flicker noise

(b) shot noise

(c) impulse noise

(d) transit-time noise

I got this question by my school teacher while I was bunking the class.

Question is from Noise in AM topic in portion Noise of Analog Communications

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Right option is (d) transit-time noise

To explain I would say: If the time taken by electrons to travel from emitter to collector becomes comparable to the period of the signal which is amplified which is only possible at high frequencies called transit time. At transit time noise input admittance of the transmitter increases.

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