Which of the following is an example of carbylamine reaction?

Options

1. A
   
2. B
   
3. C$$\begin{aligned} \mathrm{Ph}-\mathrm{NH}_2+\mathrm{CHCl}_3+3 \mathrm{KOH}(\text{ alc. }) \xrightarrow{\Delta} \\ \mathrm{Ph}-\mathrm{NC}+3 \mathrm{KCl}+3 \mathrm{H}_2 \mathrm{O}\end{aligned}$$
4. D$\mathrm{Ph}_2-\mathrm{NH}+\mathrm{HONO} \longrightarrow \mathrm{Ph}_2-\mathrm{N}-$\mathrm{N}=\mathrm{O}$+\mathrm{H}_2 \mathrm{O}$