(a) The surveyors or professional engineers composing the boundary commission shall each receive such compensation as the court shall fix for the time necessarily spent in the discharge of their duties and shall also be reimbursed the necessary expenses incurred by them respectively while engaged upon the work of the commission.

(b) The boundary commission may employ such assistants as the court shall allow, at a compensation to be fixed by the court. Assistants shall also be reimbursed for actual necessary expenses incurred while employed by the commission.

(c) All costs, including the necessary expenses of advertising the meeting of the boundary commissioners as hereinafter provided, and in procuring and setting the permanent monuments necessary to mark the county line, the expenses of the boundary commission and its assistants and all other expenses necessarily incurred, shall be paid by the interested counties jointly, in equal parts, or by any party or parties to the proceeding as the court may direct, upon presentation of properly itemized bills, duly verified by affidavit of the person claiming payment or someone on the person's behalf.