\textbf{53 --} A string of length $60\,\text{cm}$ is fixed at both ends and vibrates, forming $3$ antinodes along its length. If $300\,\text{Hz}$ is a harmonic frequency of this string, how many Hz is the fundamental frequency and what is the harmonic number of $300\,\text{Hz}$?
\begin{itemize}
\item[(1)] $500$ and $300$
\item[(2)] $120$ and $300$
\item[(3)] $120$ and $100$
\item[(4)] $500$ and $100$
\end{itemize}