If $$\cosec^{2} \theta + \cot^{2} \theta = \frac{5}{3}$$, then what is value of $$\cot 2\theta$$

A

$$\frac{1}{\sqrt{3}}$$

B

$$-\frac{1}{\sqrt{3}}$$

C

$$\frac{2}{\sqrt{3}}$$

D

$$-\frac{2}{\sqrt{3}}$$