Find the equation of the chord of the parabola $y^2=12x$ which is bisected at $(5,-7)$

Question

$\begin{array}{1 1}(A)\;6x-7y+19=0\\(B)\;6x+7y+19=0 \\(C)\;6x+9y+20=0 \\(D)\;3x+4y+12=0 \end{array}$