156. A p-type semiconductor is :
1. A silicon crystal doped with arsenic impurity.
2. A silicon crystal doped with aluminium impurity.
3. A germanium crystal doped with boron impurity.
4. A germanium crystal doped with phosphorus impurity.
(a) a, c are correct
(b) a, d are correct
(c) b, c are correct
(d) b, d are correct
Answer : (c)
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