यदि $\left(\frac{1+i}{1-i}\right)^{x}=1$ है,तो

  • A
    $x=4n+1, n \in N$
  • B
    $x=2n+1, n \in N$
  • C
    $x=2n, n \in N$
  • D
    $x=4n, n \in N$

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