MCQ

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If ${\left( {\frac{{1 + i}}{{1 - i}}} \right)^x} = 1,$ then

• ✓
  $x = 4n$, 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
  $x = 2n + 1$, where $n$ is any positive integer