Find the area of the region bounded by the ellipse $\frac{\Large x^2}{\Large 4 } + \frac{\Large y^2}{\Large 9} = 1$

Question

$\begin{array}{1 1} 6\pi sq.units \\12\pi sq.units. \\ 18\pi sq.units. \\ 8\pi sq.units.\end{array}$