The least positive integer \( n \) for which \( \left(\frac{1+i}{1-i}\right)^{n} \) is real, is ...

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The least positive integer \( n \) for which \( \left(\frac{1+i}{1-i}\right)^{n} \) is real, is
(A) 2
(B) 4
(C) 8
(D) none of these
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