(1) The following shall be exempt from taxation under the provisions of part 1 of this article 26:
(a) All sales made to charitable organizations, in the conduct of their regular charitable functions and activities;
(b)
(I) Effective July 1, 1995, all occasional sales by a charitable organization.
(II) For purposes of this paragraph (b), "occasional sales" means retail sales of tangible personal property, including concessions, for fund-raising purposes if:
(A) The sale of tangible personal property or concessions by the charitable organization takes place no more than twelve days, whether consecutive or not, during any one calendar year;
(B) The funds raised by the charitable organization through these sales are retained by the organization to be used in the course of the organization's charitable service; and
(C) The funds raised by the charitable organization through these sales do not exceed twenty-five thousand dollars during any one calendar year.
(c) On or after September 1, 2008, a sale by an association or organization of parents and teachers of public school students that is a charitable organization, if the association or organization uses the funds raised through the sale for the benefit of a public school or an organized public school activity or to pay the reasonable expenses of the association or organization.