The term Pax Romana refers to the
a. expansion of the Roman empire during the time of Octavian.
b. period that involved the reign of Octavian.
c. wars that brought the Ptolemies and Egypt into the empire.
d. period between 27 B.C.E. and 180 C.E. when Rome enjoyed an overall stability and peace.
e. return to a republican-style government after the death of Caesar.