\textbf{128.} In the figure opposite, what is the length of segment $AD$?
\textit{[Figure: Triangle with vertex A at top, B at bottom left, D at bottom right, with point C on BD and internal cevian of length 7 from A, sides labeled 9 and 4, 5]}
\begin{itemize}
\item[(1)] 9
\item[(2)] $3\sqrt{10}$
\item[(3)] 10
\item[(4)] $6\sqrt{3}$
\end{itemize}