$\cos ^{-1}\left\{\cot \left(\sum_{i=1}^3 \cot ^{-1} i\right)\right\}=$ . . . . . . .

  • A
    $-\frac{\pi}{2}$
  • B
    $0$
  • C
    $\pi$
  • D
    $\frac{\pi}{2}$

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