Find the area of the region bounded by the curve $y^2=4x,x^2=4y$.

Question

$\begin{array}{1 1} \frac{16}{2}\;sq.units. \\ \frac{16}{3}\;sq.units. \\ \frac{15}{2}\;sq.units. \\ \frac{15}{3}\;sq.units\end{array}$