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-C6H5CH2NH2;  3-CH3NH2  are aliphatic primary amines. They give positive carbyl amine test but cannot give stable diazonium salt;2- CH3-NH-C2H5 is sec. amine;4- primary aryl amine,  it gives positive carbyl amine test and gives a stable diazonium salt;