What Did the "Separate but Equal" Doctrine Mean

What did the "separate but equal" doctrine mean?

A) Although the executive and legislative branches had separate powers and responsibilities, the two branches were constitutionally equal in importance.
B) Southern schools were segregated, but they had similar buildings, equivalent equipment, and equally qualified and equally paid teachers.
C) As long as facilities for whites and blacks were equivalent, they did not have to be racially integrated.
D) The northern and southern approaches to race relations were completely different, but as far as blacks were concerned they amounted to the same thing.
E) Labor and capital had different goals and different world views, but they were all equal under the law.