Let a focal chord $12x + 5y - 27 = 0$ of the parabola $y^2 = kx$ intersect the parabola at the points $P$ and $P^{\prime}$. If $S$ is the focus of this parabola,then $9(SP + SP^{\prime}) = $
- A$27$
- B$108$
- C$16 SP \cdot SP^{\prime}$
- D$4 SP \cdot SP^{\prime}$
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