Solve for $x$: $\tan^{-1}\left(\frac{1-x}{1+x}\right) = \frac{1}{2} \tan^{-1} x$,where $x > 0$.

  • A
    $\sqrt{3}$
  • B
    $1$
  • C
    $-1$
  • D
    $\frac{1}{\sqrt{3}}$

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