The electrophile that attacks the phenoxide ring in the Reimer-Tiemann reaction ($\mathrm{CHCl}{}_3$ with aqueous $\mathrm{NaOH}$) is

1. Adichlorocarbene, $\text{:}\mathrm{CCl}{}_2$
2. Bdichloromethyl cation, $\mathrm{CHCl}{}_2{}^{+}$
3. Cchlorocarbene, $\text{:}\mathrm{CHCl}$
4. Dtrichloromethyl cation, $\mathrm{CCl}{}_3{}^{+}$