If ${\tan ^{ - 1}}x + 2{\cot ^{ - 1}}x = \frac{{2\pi }}{3},$ then $x =$

  • A
    $\sqrt 2 $
  • B
    $3$
  • C
    $\sqrt 3 $
  • D
    $\frac{{\sqrt 3 - 1}}{{\sqrt 3 + 1}}$

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