During the civil war, the term "contraband camps" referred to:
a. camps in which materials such as rifles and gunpowder were kept.
b. camps of southern slaves who had escaped from their masters and entered union lines.
c. training grounds for the youthful musicians who played to raise the morale of the troops.
d. holding areas for items seized by customs agents for failure to pay tariffs.
e. places near battlefields where the union army temporarily kept confederate priso