If $$\sin \theta -\cos \theta = \frac{4}{5}$$, then find the value of $$sin \theta + \cos \theta$$.

A

$$\frac{5}{\sqrt{34}}$$

B

$$\frac{5}{\sqrt{24}}$$

C

$$\frac{\sqrt{34}}{5}$$

D

$$\frac{\sqrt{24}}{5}$$