Protest means a written objection by an interested party to any of the following:
(1) A solicitation or other request by an agency for offers for a contract for the procurement of property or services.
(2) The cancellation of the solicitation or other request.
(3) An award or proposed award of the contract.
(4) A termination or cancellation of an award of the contract, if the written objection contains an allegation that the termination or cancellation is based in whole or in part on improprieties concerning the award of the contract.