How Did the Rule of Severus Change from Previous Emperors

How did the rule of Severus change from previous emperors?

A) He eliminated rivals for power and exiled them to far-flung provinces.
B) He appointed military commanders as proconsuls to ensure loyalty of both administrators and military.
C) He granted citizenship to the areas he conquered to quell violence.
D) He launched a war against the Celtic tribes in the north.
E) He abandoned the pretense of sharing power with the Senate.