Which sentence is correct? a. A U.S. Army officer is being court martialed on charges related to an extramarital affair. b. A U.S. Army officer is being court-martialed on charges related to an extramarital affair. c. A U.S. Army officer is being court martialed on charges related to an extra-marital affair. d. A U.S. Army officer is being court-martialed on charges related to an extra-marital affair.