The range of the function $f(x) = \sqrt{|\sin^{-1}|\sin x|| - |\cos^{-1}|\cos x||}$ is

  • A
    $\{0\}$
  • B
    $\{\frac{\pi}{2}\}$
  • C
    $\{0, \frac{\pi}{2}\}$
  • D
    $[0, \frac{\pi}{2}]$

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