The equation of the plane whose foot of $\perp$ drawn from origin is $(1,2,1)$. is?

Question

$\begin{array}{1 1} (a)\:\:x+2y+z+6=0\:\: & \:\:(b)\:\:x+2y+z-6=0\:\:\\ \:\:(c)\:\:x+2y+z+4=0\:\: &\:\: (d)\:\:x+2y+z-4=0 \end{array}$