What will be the value of $$\frac{\tan 45^{\circ} - \tan 15^{\circ}}{1 + \tan 45^{\circ} \tan 15^{\circ}}$$

A

$$\sqrt{3}$$

B

$$\frac{1}{\sqrt{2}}$$

C

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

D

$$\sqrt{2}$$