$$(\sqrt{\sec^2 \theta + \cosec^2 \theta})\left(\frac{\sin \theta(1 + \cos \theta)}{1 + \cos \theta - \sin^2 \theta}\right), 0^\circ < \theta < 90^\circ$$ is equal to:

A

$$\sec^2 \theta$$

B

$$\cosec^2 \theta$$

C

$$\cot \theta$$

D

$$\tan \theta$$