Let $$0^\circ < \theta < 90^\circ . \left(1+\cot^{2}\theta\right) \left(1+\tan^{2}\theta\right) \times \left(\sin\theta - \csc\theta\right)\left(\cos\theta -\sec\theta\right)$$ is equal to:

A

$$\sin\theta + \cos\theta$$

B

$$\sin\theta\cos\theta$$

C

$$\sec\theta\csc\theta$$

D

$$\sec\theta + \csc\theta$$