Multiple Choice: The function $f(x)$ shown below has discontinuities at:

$f ( x ) = \left\{ \begin{array} { l l } { - ( 2 x + 3 ) ^ { 2 } } & { \text { for } x < - 1 } \\ { x ^ { - 2 / 3 } + 2 x } & { \text { for } - 1 \leq x \leq 1 } \\ { 3 \operatorname { cos } ( 0.1 x ) } & { \text { for } x > 1 }\end{array} \right.$