Find a unit vector in the direction of $\overrightarrow{PQ},$where $P$ and $Q$ have co-ordinates $(5,0,8)$ and $(3,3,2)$,respectively.

Question

$\begin{array}{1 1} (A)\;\Large\frac{2\hat i+3\hat j+6\hat k}{7} \\ (B)\;\Large\frac{-2\hat i+3\hat j-6\hat k}{7} \\(C)\;\Large\frac{-2\hat i+3\hat j-6\hat k}{49} \\(D)\;\Large\frac{-2\hat i-3\hat j+6\hat k}{7} \end{array}$