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Which of the following elements act as donor impurities?
| |
A. | 1, 2 and 3 [Wrong Answer] |
B. | 1, 2, 4, and 6 [Wrong Answer] |
C. | 3, 4, 5 and 6 [Wrong Answer] |
D. | 2, 4 and 5 [Correct Answer] |