If $$\sin \theta + \cos \theta = \frac{17}{13} , 0 < \theta < 90^\circ$$ ,then the value of $$\sin \theta - \cos \theta$$ is

A

$$\frac{5}{17}$$

B

$$\frac{3}{19}$$

C

$$\frac{7}{10}$$

D

$$\frac{7}{13}$$