The secondary amide NNN-methylbenzamide has the structure shown below.

Which reagents could be reacted together in a single step to prepare NNN-methylbenzamide?
C6H5NH2+CH3COCl\text{C}_6\text{H}_5\text{NH}_2 + \text{CH}_3\text{COCl}C6H5NH2+CH3COCl
C6H5COCl+CH3NH2\text{C}_6\text{H}_5\text{COCl} + \text{CH}_3\text{NH}_2C6H5COCl+CH3NH2
C6H5CONH2+CH3I\text{C}_6\text{H}_5\text{CONH}_2 + \text{CH}_3\text{I}C6H5CONH2+CH3I
C6H5CH2NH2+HCOCl\text{C}_6\text{H}_5\text{CH}_2\text{NH}_2 + \text{HCOCl}C6H5CH2NH2+HCOCl