Find the maximum area of $\Delta PSS'$ for the ellipse $\large\frac{x^2}{36}+\frac{y^2}{16}$$=1$ where S,S' are foci & P is any point on ellipse?

Question

$\begin{array}{1 1}(a)\;8\sqrt 6\\(b)\;8\sqrt 2\\(c)\;8\sqrt 5\\(d)\;\text{None of these}\end{array}$