What is the value of $$\sin 30^\circ + \cos 30^\circ - \tan 45^\circ $$?

A

$$\frac{\sqrt{3} - 1}{2}$$

B

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

C

$$\frac{\sqrt{3} + 1}{2}$$

D

$$\frac{1 - \sqrt{3}}{2}$$