Simplify : $\large\frac{2}{\sqrt 5 +\sqrt 3 }+\frac{1}{\sqrt 3 +\sqrt 2 } - \frac{3}{\sqrt 5 +\sqrt 2 }$

Question

$\begin{array}{1 1} 3 \\ 2 \\ 4 \\ 0 \end{array} $