Let $f ( x ) = \left\{ \begin{array} { l l } x ^ { 2 } & - 2 \leq x < 1 \\x ^ { 3 } & 1 \leq x \leq 2\end{array} \right.$

Multiple Choice

Let $f ( x ) = \left\{ \begin{array} { l l } x ^ { 2 } & - 2 \leq x < 1 \\x ^ { 3 } & 1 \leq x \leq 2\end{array} \right.$ The set of all critical numbers of ƒ is

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