Three charges $$Q$$, $$+q$$ and $$+q$$ are placed at the vertices of a right-angle isosceles triangle as shown below. The net electrostatic energy of the configuration is zero, if the value of Q is:

A

$$+q$$

B

$$\frac{-\sqrt{2}q}{\sqrt{2}+1}$$

C

$$\frac{-q}{1+\sqrt{2}}$$

D

$$-2q$$