\textbf{153.} According to the figure below, rectangle $ABCD$ is circumscribed about a circle with radius 3, and the circumference is $M\widehat{B}N = 120°$. What is the area of quadrilateral $OMNC$?
\textit{[Figure: Rectangle ABCD with inscribed circle centered at O, points M on AB and N inside, shaded region OMNC]}
\begin{itemize}
\item[(1)] $\dfrac{27\sqrt{3}}{4}$
\item[(2)] $\dfrac{9\sqrt{3}}{2}$
\item[(3)] $\dfrac{27\sqrt{3}}{2}$
\item[(4)] $9\sqrt{3}$
\end{itemize}
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