Using the reagents below, list in order (by letter, no period) those necessary to transform aniline into 4-bromo-2-nitroaniline You may assume any undesired regioisomers can be separated (make sure to choose the way for the BEST yield, Some combinations of reagents may work but not as well as others). Make sure to employ a blocking group. Note: Not all spaces provided may be needed. Type "na" in any space where you have no reagent.