Let $f ( x ) = - x ^ { 3 } - 6 x ^ { 2 } - 9 x + 1$

Multiple Choice

Let $f ( x ) = - x ^ { 3 } - 6 x ^ { 2 } - 9 x + 1$ Then ƒ has a point of inflection at x =

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