Larry is a high school student. He makes a personal website that allows people to publicly rate and comment on teachers that teach at his school. Some of the teachers are upset that negative things are being said about them publicly. The principal of the school contacts Larry's parents and says that Larry will be expelled if he does not take the site down. Which Supreme Court case might support Larry's site as a form of protected free speech under the Constitution?

Brown v. Board of Education
Plessy v. Ferguson
Hazelwood v. Kuhlmeier
Tinker v. Des Moines