Which one of the following not only gives foul smell when heated with chloroform and alcoholic caustic potash but also forms a stable diazonium salt with nitrous acid

 at 273 K

1-${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_2{\mathrm{NH}}_2$;  3-${\mathrm{CH}}_3{\mathrm{NH}}_2$  are aliphatic primary amines. They give positive carbyl amine test but cannot give stable diazonium salt;

2- ${\mathrm{CH}}_3-\mathrm{NH}-{\mathrm{C}}_2{\mathrm{H}}_5$ is sec. amine;

4- primary aryl amine,  

it gives positive carbyl amine test and gives a stable diazonium salt;