The distance of the point $(1,-5,9)$ from the plane $x-y+z=5$ measured along the line $x=y=z$ is ?

Question

$\begin{array}{1 1} (a)\:\:\:10\sqrt 3\:\:\:\qquad(b)\:\:5\sqrt 3\:\:\:\qquad\:\:(c)\:\:3\sqrt {10}\:\:\:\qquad\:\:(d)\:\:3\sqrt 5