Let $$\alpha$$ and $$\beta$$ be the roots of $$x^2 - 5x + 3 = 0$$ with $$\alpha > \beta$$. If $$a_n = \alpha^n - \beta^n$$ for $$n \ge 1$$, then the value of $$\frac{3a_6+a_8}{a_7}$$ is

A

2

B

3

C

4

D

5