Which of the Following Is True of Black Codes

Which of the following is true of Black Codes?

A) They codified discrimination on the basis of race and limited the rights of the newly free slaves.
B) They categorized blacks as a protected group and gave them special privileges under the Title VII of the Civil Rights Act.
C) They were mostly revisions of the post-Civil War "Slave Codes," initiated by a few states.
D) They were a subtle form of discrimination in the Northern states, while religious segregation was practiced in the South.