What Is the Principle of Separate but Equal

What is the principle of separate but equal?

A) A legal principle that allowed states to segregate the races in public facilities, as long as the state provided each race with basic access to the public facility in question
B) A legal principle that allowed states to segregate the genders in public facilities, as long as the state provided each gender with basic access to the public facility in question
C) A legal principle that allowed the national government to segregate the races in public facilities, as long as it provided each race with basic access to the public facility in question
D) A legal principle that allowed the national government to segregate the genders in public facilities, as long as it provided each gender with basic access to the public facility in question