If $$6 \tan A \left(\tan A - 1\right) = 5 - \tan A$$, Given that O < A < $$\frac{\pi}{2}$$. what is the value of $$\left(\sin A + \cos A\right)$$?

A

$$3\sqrt{5}$$

B

$$\frac{3}{\sqrt{5}}$$

C

$$5\sqrt{3}$$

D

$$\frac{5}{\sqrt{3}}$$