$ \int_{0}^{1} \sqrt{\frac{1+x}{1-x}} \, dx = $

  • A
    $ \frac{\pi}{2} + 1 $
  • B
    $ \frac{1}{2} $
  • C
    $ \frac{\pi}{2} - 1 $
  • D
    $ \frac{\pi}{2} $

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