If $$\tan A = \frac{1}{\sqrt{xx^2+x+1}}$$, $$\tan B = \frac{\sqrt{x}}{\sqrt{x^2+x+1}}$$ and $$\tan C=x^{-3}+x^{-2}+x^{-1{\frac{1}{2}}}$$, $$0 < A, B, C < \frac{\pi}{2}$$, then $$A + B$$ is equal to:

A

$$C$$

B

$$\pi - C$$

C

$$2\pi - C$$

D

$$\frac{\pi}{2} - C$$