If $g=t^{\large\frac{2}{3}}+4t^{\large\frac{-1}{2}}$, the value of g when $t=64$ is ______

Question

$\begin{array}{1 1} \large\frac{31}{2} \\ \large\frac{33}{2} \\ 16 \\ \large\frac{257}{16} \end{array}$