An employer is exempt from this chapter with respect to the employment of a person who:
(1) is less than 18 years of age and is not a high school graduate or a graduate of a vocational training program, other than a person who is employed in agriculture and whose pay is computed on a piece rate;
(2) is less than 20 years of age and is a student regularly enrolled in a high school, college, university, or vocational training program, other than a person who is employed in agriculture and whose pay is computed on a piece rate; or
(3) has a disability and who is:
(A) not more than 21 years of age;
(B) a client of vocational rehabilitation; and
(C) participating in a cooperative school-work program.