The value of $\int \limits_0^{2 \pi} \min \{|x-\pi|, \cos ^{-1}(\cos x)\} d x$ is

  • A
    $\frac{\pi^2}{4}$
  • B
    $\frac{\pi^2}{2}$
  • C
    $\frac{\pi^2}{8}$
  • D
    $\pi^2$

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