If in a $$\triangle$$ ABC, A + B = C, then $$\tan A. \tan B. \tan C$$ =

A

$$\tan A + \tan B + \tan C$$

B

$$\tan A - \tan B - \tan C$$

C

$$\tan B - \tan C - \tan A $$

D

$$\tan C - \tan B - \tan A$$