If $$x^4 + y^4 + x^2y^2 = 117$$ and $$x^2 + y^2 - xy = 3(4 + \sqrt{3})$$, then the value of $$(x^2 + y^2)$$ will be:

A

9

B

$$6\sqrt{3}$$

C

12

D

$$13\sqrt{3}$$