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If $[ $$\frac{1+i}{1-i} ] ^ x$ =$1$ then

(A) x = 2n + 1, where n is any positive integer

(B) x = 2n, where n is any positive integer

(C) x = 4n + 1, where n is any positive integer

(D) x = 4n, where n is any positive integer

(A) x = 2n + 1, where n is any positive integer

(B) x = 2n, where n is any positive integer

(C) x = 4n + 1, where n is any positive integer

(D) x = 4n, where n is any positive integer

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