Multiple Choice: If $f ( x ) = \left\{ \begin{array} { l l } { 3 x ^ { 3 / 2 } + 2 } & { \text { for } x \leq 4 } \\ { 6 \sqrt { 2 x + 8 } + 1 } & { \text { for } x > 4 } \end{array} \right.$, then $\lim\limits _ { x \rightarrow 4 } f ( x ) =$