What will be the magnitude of the electric field at point $$O$$ as shown in the figure? Each side of the figure is $$l$$ and perpendicular to the other.

A

$$\frac{1}{4\pi\varepsilon_0} \frac{q}{l^2}$$

B

$$\frac{1}{4\pi\varepsilon_0} \frac{q}{(2l^2)}\left(2\sqrt{2} - 1\right)$$

C

$$\frac{q}{4\pi\varepsilon_0 (2l)^2}$$

D

$$\frac{1}{4\pi\varepsilon_0} \frac{2q}{2l^2}\left(\sqrt{2}\right)$$