Let $f ( x ) = 2 x ^ { 3 } - 15 x ^ { 2 } + 36 x + 5$

Multiple Choice

Let $f ( x ) = 2 x ^ { 3 } - 15 x ^ { 2 } + 36 x + 5$ The set of all critical numbers of ƒ is

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