If $$\overline{a} + \overline{b} + \overline{c} = 0$$ and $$|\overline{a}| = 3, |\overline{b}| = 5, |\overline{c}| = 7,$$ then the angle between $$\overline{a}$$ and $$\overline{b}$$ is

A

$$45^\circ$$

B

$$30^\circ$$

C

$$90^\circ$$

D

$$60^\circ$$