Simplify the expression
$$\left(36 p^{2}+49 q^{2}\right)\left(6p+7q \right)\left(6p -7q\right)$$

A

$$1296 p^{4} + 2401 q^{4}$$

B

$$36 p^{4} - 49 q^{4}$$

C

$$1296 p^{4} - 2401 q^{4}$$

D

$$36 p^{4} + 49 q^{4}$$