If $L\rightarrow\:\:\large\frac{x-1}{3}=\frac{y+1}{2}=\frac{z-3}{-1}$ and the plane $P\rightarrow\:\:x-2y-z=0$, then which of the following is true?

Question

$\begin{array}{1 1} (a)\:\:L\:is\:\perp \:P\:\: \\ (b)\:\:L\:lies\:in\:P\:\:\\(c)\:\:L\:is\:||\:to\:P\:\: \\ (d)\:\:L\:intersects\:P\:but\:not\:\perp \end{array} $