Let $f ( x ) = x ^ { 4 } - 4 x ^ { 3 } + 16 x$

Multiple Choice

Let $f ( x ) = x ^ { 4 } - 4 x ^ { 3 } + 16 x$ Then ƒ has a point of inflection at x =

A) $- \frac { 1 } { 3 } , 0$
B) $1,0$
C) $\frac { 1 } { 3 } , 0$
D) $- 1,0$
E) $2,0$