Factor
- $27 x^{6}+343 y^{6}$ A) $\left(3 x^{3}+7 y^{3}\right)\left(9 x^{3}-21 x^{3} y^{3}+49 y^{3}\right)$

Multiple Choice

Factor.
- $27 x^{6}+343 y^{6}$

A) $\left(3 x^{3}+7 y^{3}\right) \left(9 x^{3}-21 x^{3} y^{3}+49 y^{3}\right)$
B) $\left(3 x^{2}+7 y^{2}\right) \left(9 x^{4}+49 y^{4}\right)$
C) $\left(3 x^{2}+7 y^{2}\right) \left(9 x^{4}-21 x^{2} y^{2}+49 y^{4}\right)$
D) $\left(3 x^{2}-7 y^{2}\right) \left(9 x^{4}+21 x^{2} y^{2}+49 y^{4}\right)$