Which among the following reactions represents Carbylamines reaction?

1. A \(\mathrm{R}-\mathrm{NH}_2+\mathrm{CHCl}_3+3 \mathrm{KOH} \underset{\text { alc }}{\stackrel{\Delta}{\longrightarrow}}\) \(\mathrm{R}-\mathrm{NC}+3 \mathrm{KCl}+3 \mathrm{H}_2 \mathrm{O}\)
2. B \(\mathrm{R}-\mathrm{NH}_2+\mathrm{NHO}_2 \stackrel{\text { (i) } \mathrm{NaNO}_2+\mathrm{HCl}}{\longrightarrow}\) \(\mathrm{R}-\mathrm{OH}+\mathrm{N}_2 \uparrow+\mathrm{HCl}\)
3. C \(\mathrm{R}-\mathrm{NH}_2+\mathrm{CH}_3 \mathrm{COCl} \stackrel{\text { pyridine }}{\longrightarrow}\)\(\mathrm{R}-\mathrm{NH}-\mathrm{COCH}_3+\mathrm{CHl}\)
4. D \(\mathrm{R}-\mathrm{NH}_2+\mathrm{R}-\mathrm{X} \rightarrow \mathrm{R}_4 \stackrel{+}{\mathrm{N}} \overline{\mathrm{X}}+2 \mathrm{HX}\)