Determine All Critical Points for the Function $$f ( x ) = 80 x ^ { 3 } - 3 x ^ { 5 }$$

Multiple Choice

Determine all critical points for the function.
- $$f ( x ) = 80 x ^ { 3 } - 3 x ^ { 5 }$$

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