Even Though It Has Been Mostly "Undone" by Later Cases

Even though it has been mostly "undone" by later cases, the 1969 case of Tinker v. Des Moines Independent Community School District established which of the following legal principles?

A) parameters for defining indecency and obscenity are different on high school and college campuses than in the community at large
B) high school teachers have the same "academic freedom" rights as college professors
C) students do not lose their constitutional rights when they walk into a high school or college campus
D) non-sanctioned or "underground" newspapers can be banned by high school principals
E) the administration of a public school is not required to tolerate speech that is inconsistent with its educational mission