The energy band diagrams for three semiconductor samples of silicon are as shown. We can then assert that

(a) Sample X is undoped while samples Y and Z have been doped with a third group and a fifth group impurity respectively
(b) Sample X is undoped while both samples Y and Z have been doped with a fifth group impurity
(c) Sample X has been doped with equal amounts of third and fifth group impurities while samples Y and Z are undoped
(d) Sample X is undoped while samples Y and Z have been doped with a fifth group and a third group impurity respectively

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