Using $$\cot (A - B) = \frac{\cot A \cot B + 1}{\cot B - \cot A}$$, find the value of $$\cot 15^{\circ}$$

A

$$2 + \surd{3}$$

B

$$2 - \surd{3}$$

C

$$\surd{3} - 1$$

D

$$\surd{3} + 1$$