If $$\frac{\cos \beta}{\sec \alpha} = 15$$ and $$\frac{\sin \beta}{\sec \alpha} = 16$$, then the value of $$\sin^2 \beta$$ is______________.

A

$$\frac{256}{481}$$

B

$$-\frac{256}{481}$$

C

$$\frac{481}{256}$$

D

$$-\frac{481}{256}$$