If $$A:B = C:D$$, then the value of $$\frac{A^{2}+B^{2}}{C^{2}+D^{2}}$$ is

A

$$\frac{1}{2}$$

B

$$\frac{A+B}{C+D}$$

C

$$\frac{A-B}{C-D}$$

D

$$\frac{A\times B}{C\times D}$$