I want to use subfigures to place three figures like this:

The following is the code I used:
\begin{figure}
\begin{tabular}{|c|c|}
\hline
\multirow{2}{*}{
\begin{subfigure}[h]{0.3\textwidth}
\centering
\includegraphics{Fig2}
\caption{Argumentation Framework $I$}
\label{fig:afexampleI}
\end{subfigure}
}
&
\begin{subfigure}[h]{0.6\textwidth}
\centering
\includegraphics{Fig3}
\caption{Argumentation Framework $III$}
\label{fig:afexampleIII}
\end{subfigure} \\
&
\begin{subfigure}[h]{0.6\textwidth}
\centering
\includegraphics{Fig4}
\caption{Argumentation Framework $II$}
\label{fig:afexampleII}
\end{subfigure} \\
\hline
\end{tabular}
\caption{Argumentation Frameworks}\label{fig:afexample}
\end{figure}
However, this is the result:

P.S. I used \hline in order to better illustrate the figures, otherwise there should be no borders for the tabular environment used.




