If $\tan^{-1} \frac{a+x}{a} + \tan^{-1} \frac{a-x}{a} = \frac{\pi}{6}$,then $x^2 =$

  • A
    $2\sqrt{3} a$
  • B
    $\sqrt{3} a$
  • C
    $2\sqrt{3} a^2$
  • D
    None of these

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