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In a BJT, which of the following layers is heavily doped?

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In a BJT, which of the following layers is heavily doped?

(a) Collector

(b) Emitter

(c) Base

(d) Electron

The question was asked in an interview.

My query is from BJT Construction and Operation topic in division BJT Biasing of Analog Circuits

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Best answer
Right answer is (b) Emitter

The best I can explain: The emitter is the most heavily doped and contains the maximum amount of charge carriers. It is the emitter’s task to inject carriers into the base. These bases are thin and lightly doped. For npn B JT, emitter injects electrons, and for pnp, it injects holes.

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