If  $P=(3,4,-12)$ then the d.c’s of  $\overrightarrow{OP}$ are

• A

  $\left(\frac{{\displaystyle 3}}{{\displaystyle 13}},\frac{{\displaystyle 4}}{{\displaystyle 13}},-\frac{{\displaystyle 12}}{{\displaystyle 13}}\right)$

• B

  $(6,6,-3)$

• C

  $\left(-\frac{{\displaystyle 2}}{{\displaystyle 7}},\frac{{\displaystyle 3}}{{\displaystyle 7}},\frac{{\displaystyle 6}}{{\displaystyle 7}}\right)$

• D

  $(2,2,-1)$