If $$\frac{\sin \theta + \cos \theta}{\sin \theta - \cos \theta} = \frac{3}{2}$$, then the value of $$\sin^{4} \theta - \cos^{4} \theta$$ is:

A

$$\frac{5}{12}$$

B

$$\frac{12}{13}$$

C

$$\frac{11}{12}$$

D

$$\frac{5}{13}$$