\textbf{234 --} How many of the following statements are correct?
\begin{itemize}
\item The number of oxidizing species decreases in reactions.
\item In the decomposition of silver bromide by light, $\text{Ag}^+$ ion is the oxidizing species.
\item In the reaction of copper(II) chloride and iron(III), nitrate ions, $\text{Cl}^-$ and $\text{NO}_3^-$ are spectator ions.
\item The chemical reaction that occurs when light shines on black and white photographic films is a type of combination reaction.
\end{itemize}
$$
(1)\quad 1 \qquad (2)\quad 2 \qquad (3)\quad 3 \qquad (4)\quad 4
$$