Determine All Critical Points for the Function $$y = 4 x ^ { 2 } - 128 \sqrt { x }$$

Multiple Choice

Determine all critical points for the function.
- $$y = 4 x ^ { 2 } - 128 \sqrt { x }$$

A) $x = 0$
B) $x = 4$
C) $x = 0$ and $x = 4$
D) $x = 0 , x = 4$ , and $x = - 4$