Simplify the rational expression :<br> <br> $\qquad \qquad \qquad \large\frac{6k^2-18k-24}{2k+2} $

Question

$\begin{array}{1 1} (a)\;\frac{3}{k-4} \\ (b)\;\frac{k-4}{3}\\ (c)\;3(k-4) \\(d)\;-3(k-4) \end{array} $