The area of an isosceles right angle triangle whose vertices are $(-5,6) ,(3,0)$ and $(9,8)$ is ____ sq. units

Question

$\begin{array}{1 1}(A) \;\sqrt {50}\;sq.units\\(B)\;50\;sq.units \\(C)\;5 \sqrt {10}\;sq.units\\(D)\;10\sqrt {5}\;sq.units\end{array}$