Which reform provided the most direct benefit to darius the first bureaucracy in the persian empire

Darius I "the Great" (549-486 BCE) was a king of Persia who ruled for 35 years, from September 522 BCE to October 486 BCE. ... Thus, with Darius as Great King, Achaemenian Persia became the largest empire in the world. Darius was responsible for more than just the expansion of the empire.

I hope my answer has come to your help. God bless and have a nice day ahead!

A. democrat, republican, whig, other.(the democratic and republican parties are the main 2 american political parties, the whig party was popular among the early presidents, and the “other” option allows for outliers)