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Where does degeneration take place in a self – alpha cutoff frequency?

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Where does degeneration take place in a self – alpha cutoff frequency?

(a) Across RB

(b) Across RE

(c) No degeneration occurs

(d) Across RC

I got this question in final exam.

I would like to ask this question from The Alpha Cutoff Frequency topic in division High Frequency Transistor of Electronic Devices & Circuits

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Correct answer is (b) Across RE

Explanation: Degeneration or negative feedback occurs across RE which in turn stabilizes the fluctuations of current IE due to temperature changes and variations in VBE and α. In a stable alpha cutoff frequency, the variations in the value of VBE and α do not affect the stability of the system.

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