read the excerpt below.

"Brown v. Board of education (1954) in this decision the supreme court overturned Plessy v. Ferguson (1896) and found that the segregation in the public schools violated the constitution. lower courts were expected to follow this decision in future similar cases."

which is an example f what was established in the Brown decision?

a. a precedent
b. stare decisis
c. class action
d. standing to sue