Which of these are used for doping? I. A trivalent impurity. II. A ...

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Which of these are used for doping?
I. A trivalent impurity.
II. A tetravalent impurity.
III. A pentavalent impurity.
IV. A monovalent impurity.
(a) I and II
(b) II and IV
(c) II and III
(d) I and III
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