If (X + a) is a common factor of $$x^{2}-(2+\sqrt{2})x+2\sqrt{2}$$ and $$ x^{2}-2\sqrt{2}x+2$$ then the vlaue of $$ \sqrt{(5\sqrt{2}-a)3\sqrt{2}}$$ is :

A

4

B

2

C

6

D

8