Describe the Interval(s) on Which the Function $f ( x ) = \left\{ \begin{array} { l } x ^ { 2 } - 100 ,\\10 x + 100,\end{array} \right.$

Multiple Choice

Describe the interval(s) on which the function $f ( x ) = \left\{ \begin{array} { l } x ^ { 2 } - 100 ,\\10 x + 100,\end{array} \right.$ $\begin{array} { l } x \leq 0 \\x > 0\end{array}$ is continuous.

A) $( - \infty , 0 ]$ and $( 0 , \infty )$
B) $( - \infty , 0 )$ and $[ 0 , \infty )$
C) $( - \infty , 0 )$ and $( 0 , \infty )$
D) $( - \infty , \infty )$
E) none of these choices