The Service may cancel a solicitation in whole or in part before opening of bids or proposals when, in the determination of the procurement officer, cancellation is in the best interest of the Service. Bids or proposals shall be returned to the bidders or offerors together with a notice of cancellation. After opening of bids or proposals, the Service may reject all proposals or bids in whole or in part when, in the determination of the procurement officer, rejection is in the best interest of the agency. Notice of rejection of all bids or proposals shall be sent to all vendors that submitted bids or proposals. Determination of the reasons for cancellation or rejection shall be made part of the procurement file. The Service may reject a bid or proposal in whole or in part when it is in the Service's reasonable best interest to do so. Reasons may include, but are not limited to, the following: The respondent that submitted the bid or proposal is not responsible; The bid or offer is not responsive or the offer is not reasonably susceptible of being selected for award; The price is not reasonable; or The respondent is debarred or otherwise ineligible for award and the period of debarment or ineligibility has not expired. Opened bids or proposals shall be retained in the procurement file. Unopened bids or proposals shall be returned to the respondent, or otherwise disposed of by the Service.