Let $$\alpha, \beta$$ be such that $$\pi < \alpha - \beta < 3\pi$$. If $$\sin\alpha + \sin\beta = -\frac{21}{65}$$ and $$\cos\alpha + \cos\beta = -\frac{27}{65}$$, then the value of $$\cos\frac{\alpha - \beta}{2}$$ is

A

$$-\frac{3}{\sqrt{130}}$$

B

$$\frac{3}{\sqrt{130}}$$

C

$$\frac{6}{65}$$

D

$$-\frac{6}{65}$$