$\int_{0}^{\frac{\pi}{2}} \log \left[\sqrt{\frac{1-\cos 2x}{1+\cos 2x}}\right] dx =$

  • A
    $1$
  • B
    $\frac{\pi}{4}$
  • C
    $0$
  • D
    $\frac{\pi}{8}$

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