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Where does degeneration take place in a self – bias circuit?

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Where does degeneration take place in a self – bias circuit?

(a) Across RB

(b) Across RE

(c) No degeneration occurs

(d) Across RC

The question was asked during an interview.

The origin of the question is Stabilization against Variations in VBE and Beta for Self Bias Circuit in chapter Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits

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Correct option is (b) Across RE

The best I can explain: 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 β.

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