What is the sum to infinity of the series,
$$3+6x^{2}+9x^{4}+12x^{6}+$$........given $$\mid x$$ < 1 ?

A

$$\frac{3}{1+x^{2}}$$

B

$$\frac{3}{(1+x^{2})^{2}}$$

C

$$\frac{3}{(1-x^{2})^{2}}$$

D

$$\frac{3}{(1-x^{2})}$$