African american played important roles for both sides during the war. which statement is not true?

A
 a) African Americans served as members of the Union army. 
b) Slaves worked in the military camps of the Confederate army. 
c.) Slaves served as soldiers in the Confederate army. 
d.) African Americans served as spies and guides for the Union.

out of this (c) would not be true cause they did not even like to look or be by a slave so for them to have them serve in the confederate army was a disgrace for them.