Find the Length of the Curve $$x = 7 \sin ^ { 3 } t , y = 7 \cos ^ { 3 } t , 0 \leq t \leq \pi$$

Find the length of the curve.
- $$x = 7 \sin ^ { 3 } t , y = 7 \cos ^ { 3 } t , 0 \leq t \leq \pi$$

A) 7
B) 42
C) 14
D) 21