Sec. 12. Award of a contract under section 11 of this chapter is subject to the following:
(1) A requirement of an applicable statute to award a contract to a responsible and responsive bidder.
(2) A requirement of an applicable statute to award a contract:
(A) to the best bidder; or
(B) in the case of a purchase under IC 5-22-9, to the offeror whose offer is most advantageous to the governmental body.
(3) The authority of the purchasing agent under IC 5-22-17-12 to award contracts separately or for a combination of a line or class of supplies.