The simplified form of $$\left(7x + 4y\right)^{2} + \left(7x − 4y\right)^{2}$$ is:

A

$$98x^{2} + 32y^{2}$$

B

$$98x^{2} + 32y^{2} - 5xy$$

C

$$32x^{2} + 98y^{2}$$

D

$$98x^{2} - 32y^{2}$$