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Which of the following expressions represent the correct formula for the density of electrons occupying the donor level?

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Which of the following expressions represent the correct formula for the density of electrons occupying the donor level?

(a) nd=Nd-Nd^+

(b) nd=Nd-Nd^–

(c) nd=Nd+Nd^+

(d) nd=Nd+Nd^–

I got this question in an international level competition.

My question is from Donor and Acceptor impurities topic in division Conduction in Semiconductors of Electronic Devices & Circuits

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The correct answer is (a) nd=Nd-Nd^+

Easiest explanation: The density of the electrons is equal to the electrons present in the substrate minus the number of donors present.

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