What Supreme Court case established the separate but equal doctrine?

What Supreme Court decision rules that separation of the races in public accommodations was legal and did not violate the 14th Amendment?

a

Plessy v Ferguson

b

Plessy v Jim Crows

c

Brown v Board of Education

d

Plessy v Brown

The Supreme Court case that established "the separate but equal" doctrine was Plessy v Ferguson, (option a). According to this doctrine, racial segregation did not violate the Fourteenth Amendment to the United States Constitution which guarantees "equal protection" under the law to everyone.

1. plessy v Ferguson

2. plessy v Ferguson