What was the decision of the Supreme Court in Plessy v. Ferguson (1896)?

Responses
A The 15th Amendment failed to guarantee the right to vote to all males.The 15th Amendment failed to guarantee the right to vote to all males.
B The Black Codes were unconstitutional.The Black Codes were unconstitutional.
C The citizenship principle established in Dred Scott v. Sanford was repealed.The citizenship principle established in Dred Scott v. Sanford was repealed.
D Racial segregation did not violate the equal protection clause of the 14th Amendment.

D Racial segregation did not violate the equal protection clause of the 14th Amendment.