(a) It is a defense to an action under this chapter that, at the time of the violation of the rule:
(1) the rule was not a current rule of the national collegiate athletic association; or
(2) the rule had been substantially changed by the national collegiate athletic association.
(b) It is a defense to an action under Section 131.003 that, at the time of the violation of the rule, the defendant was:
(1) an employee of the national collegiate athletic association whose rule was violated;
(2) an employee of the regional collegiate athletic association;
(3) an employee of a member institution of the regional collegiate athletic association; or
(4) a student at a member institution of the regional collegiate athletic association.
(c) It is a defense to an action under Section 131.004 that, at the time of the violation of the rule, the defendant was:
(1) an employee of the national collegiate athletic association whose rule was violated;
(2) an employee of the regional collegiate athletic association of which the institution is a member;
(3) an employee of the institution; or
(4) a student at the institution.