(1) The board of regents and each state university board are authorized to establish from time to time reasonable and appropriate rules and policies defining residency of students, which shall be used for the purpose of determining whether or not out-of-state tuition shall be charged to a student enrolling in a state college or university subject to this chapter.
(2) The board of regents or a state university board may classify a student as a Tennessee resident and charge the student in-state tuition, if the student is a citizen of the United States, has resided in Tennessee for at least one (1) year immediately prior to admission, and has: Graduated from a Tennessee public secondary school;
(3) Graduated from a private secondary school that is located in this state; or
(4) Earned a Tennessee high school equivalency diploma.
(5) Subdivision (b)(1) shall not be construed to limit the authority of the board of regents or a state university board under subsection (a) to establish other reasonable and appropriate rules defining additional categories of residents.