If $$\theta$$=60°then $$\frac{1}{2}\sqrt{1+\sin\theta}+ \frac{1}{2}\sqrt{1-\sin\theta}$$ is equal to

A

$$\cot\frac{\theta}{2}$$

B

$$\sec\frac{\theta}{2}$$

C

$$\sin\frac{\theta}{2}$$

D

$$\cos\frac{\theta}{2}$$