Find all critical points and domain endpoints for the function $y=x^3-192\sqrt{x}$.

• A. Domain: $[4,\infty )$Critical points: $x=0$, $x=4$
• B. Domain: $[0, \infty)$Critical points: $x=0$, $x=4$
• C. Domain: $[4,\infty)$Critical point: $x=4$
• D. Domain: $[0,\infty )$Critical point: $x=0$