In $\Delta PQR$,$m \angle Q = 90^{\circ}$ and $\overline{QM}$ is an altitude. If $PM = 8$ and $RM = 12$,then $QM = \dots$

  • A
    $4 \sqrt{6}$
  • B
    $8 \sqrt{3}$
  • C
    $10$
  • D
    $18$

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