Let $f ( x ) = \left\{ \begin{array} { c c } 3 x & - 1 < x < 0 \\x + 4 & 0 \leq x < 4 \\2 x & 4 < x \leq 7\end{array} \right.$

Multiple Choice

Let $f ( x ) = \left\{ \begin{array} { c c } 3 x & - 1 < x < 0 \\x + 4 & 0 \leq x < 4 \\2 x & 4 < x \leq 7\end{array} \right.$ Which of the following is true for $\lim _ { x \rightarrow 4 } f ( x )$ ?

A) -3
B) 0
C) 4
D) 8
E) Does not exist