If the coordinates of a point $P$ with respect to the origin $O$ are $(3, 12, 4)$,then the direction cosines of $OP$ are ..........

  • A
    $3, 12, 4$
  • B
    $\frac{1}{4}, \frac{1}{3}, \frac{1}{2}$
  • C
    $\frac{3}{\sqrt{13}}, \frac{1}{\sqrt{13}}, \frac{2}{\sqrt{13}}$
  • D
    $\frac{3}{13}, \frac{12}{13}, \frac{4}{13}$

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