The simplified form of $$(x + 2y)^{3} + (x - 2y)^{3}$$ is:

A

$$2x^{3} + 24xy^{2}$$

B

$$2x^{3} - 24xy^{2}$$

C

$$x^{3} - 8y^{3}$$

D

$$x^{3} + 8y^{3}$$