If $$\cos \theta - \sin \theta = \sqrt{2} \sin \theta$$, then ($$\cos \theta + \sin \theta $$) is:

A

$$ -\sqrt{2} \cos \theta$$

B

$$ \sqrt{2} \cos \theta$$

C

$$ \sqrt{2} \tan \theta $$

D

$$ -\sqrt{2} \sin \theta$$