The sum of $$\frac{1}{x + y}$$ and $$\frac{1}{x - y}$$ is

A

$$\frac{2x}{(y^2 - x^2)}$$

B

$$\frac{2y}{(x^2 - y^2)}$$

C

$$\frac{2x}{(x^2 - y^2)}$$

D

$$\frac{-2y}{(x^2 - y^2)}$$