Let $f ( x ) = x ^ { 3 } - 9 x ^ { 2 } + 15 x$

Multiple Choice

Let $f ( x ) = x ^ { 3 } - 9 x ^ { 2 } + 15 x$ Then ƒ has a relative maximum at x =

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