Which of the following would not be considered a special district?
a. the roosevelt school district, which is run by an elected board of regents and overseen by the state of arizona
b. the alaskan port authority, which is a state-run agency that controls the seaports along the alaskan coast, and enforces security regulations and taxes shipping companies that wish to use the port
c. the state beach authority, which regulates the public beaches in washington; while it receives funding and authority from the state, it charges entrance fees and acts independently of any beach towns