Find the values of $k$ for which the line $(k-3)x-(4-k^2)y+k^2-7k+6=0$ is Parallel to the $x$ axis.

Question

$\begin {array} {1 1} (A)\;k=3 & \quad (B)\;k=-3 \\ (C)\;k=\large\frac{1}{3} & \quad (D)\;k=-\large\frac{1}{3} \end {array}$