33. The importance of Keyishian v. Board of Regents is rooted in which of the following?

a. Tenure protects a professor's employment.

b. A public employee who speaks for the employer has a First Amendment protection.

c. A professor who speaks on a matter of public importance has a First Amendment protection.

d. Governmental oversight that creates the possibility for censorship, sanction, or any other retaliatory action can thwart the free exchange of ideas and, thus, academic freedom.