If the extreme values of the function $f(x)=(2 \sqrt{6}+1) \cos x+(2 \sqrt{2}-\sqrt{3}) \sin x-6$ are $m$ and $M$,then $\sqrt{|M^2-m^2|}=$

  • A
    $6$
  • B
    $12$
  • C
    $6 \sqrt{2}$
  • D
    $12 \sqrt{3}$

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