Which of the following statements concerning the depletion zone of an unbiased $PN$ junction is (are) true?
- AThe width of the zone is independent of the densities of the dopants (impurities).
- BThe width of the zone is dependent on the densities of the dopants.
- CThe electric field in the zone is produced by the ionized dopant atoms.
- DBoth $(b)$ and $(c)$.
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