In a $\triangle ABC$,suppose none of the angles are multiples of $\frac{\pi}{2}$,then what is the value of $\cot A \cot B + \cot B \cot C + \cot A \cot C$?

  • A
    $\infty$
  • B
    $1$
  • C
    $-1$
  • D
    $0$

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