(1) The Board shall execute any contract, but may, by policy, delegate signing authority to County Officials, excluding their designees, for any such contracts and/or change orders hereunder. Notwithstanding a delegation of signing authority by the Board, nothing herein is intended to preclude County Officials from presenting the contract to the Board for its action.

(2) Where the Board has executed the contract and the contract provides for an option to extend the term of the contract or increase the quantities to be purchased, the County Official responsible for the management of that contract shall have the authority to exercise the option and execute any documents necessary to do so.

(3) All purchases and/or services shall be evidenced by a purchase order, invoice, contract of sale or the like. The Board shall establish, by policy, the requirements for written contracts.