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Given that the BJT is completely saturated, what is the overdrive?

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Given that the BJT is completely saturated, what is the overdrive?

(a) Overdrive = 1

(b) Overdrive < 1

(c) Overdrive > 1

(d) Overdrive > 0

This question was addressed to me in an interview for internship.

Query is from Transistor Switching Network topic in portion Transistor Biasing and Low Frequencies of Analog Circuits

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Right answer is (c) Overdrive > 1

The best I can explain: Overdrive during BJT saturation is the ratio of its normal β and its forced β. Forced β is the ratio of IC(sat) and IB when BJT is in saturation. Since in saturation IC is constant and IB increases thus, IC/IB decreases and the forced β is less than the normal β. Hence the overdrive > 1. In hard/strong saturation, β>>1.

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