Regarding an n-type semiconductor, which statement is correct?

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1. Regarding an n-type semiconductor, which statement is correct?

Electrons are its only charge carriers, with no holes present at all

Holes are its only charge carriers, with no electrons present at all

Electrons are the majority carriers, while holes remain present as minority carriers

None of the above

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An n-type semiconductor is dominated by electrons from its pentavalent dopant, but some holes still exist too, as minority carriers generated by ordinary thermal activity.