Which of the following statements about guerrilla warfare in indian territory during the 1860s is true?

a. after 1865, the only warfare in indian territory was guerrilla warfare.

b. members of the union forces were the only group to use guerrilla tactics in indian territory.

c. the only people involved in guerrilla warfare in indian territory were confederate guerrillas referred to as “bushwhackers.”

d. all fighting during the civil war in indian territory involved guerrilla tactics.