Identify the principle of federalism

Mark each statement if it describes the roman empire at its height. choose all answers that are correct. a-the empire stretched from spain to assyria and from north africans great britain. b- there was several official languages in the vast roman empire. c- a series of roads unified the roman empire. d- set legal principles and respect for the governed unify the roman empire.e- a single currency was established to facilitate trade within the empire.