Which is correct about Tetrarchy?
A. it was instituted byRoman EmperorDiocletianin 293, who divided the Empire into East and West ruled separately by Augustus and Caesar.
B. Diocletian understood that the huge Roman Empire could be (and often was) taken over by any general who chose to assassinate the emperor. This, of course, caused significant political upheaval; it was virtually impossible to unite the empire. So he divided the empire into four parts in order to make it more manageable.
C. The stability of this system suffered greatly after Diocletian and his successor retired from office.
D. All of the above