; (C) interior design; (D) performance of substantial construction work for facility, infrastructure, and environmental restoration projects; (E) delivery and supply of construction materials to construction sites; or (F) construction or substantial alteration of public buildings or public works; and (2) the term reverse auction means, with respect to any procurement by an executive agency— (A) a real-time auction conducted through an electronic medium among two or more offerors who compete by submitting bids for a supply or service contract, or a delivery order, task order, or purchase order under the contract, with the ability to submit revised lower bids at any time before the closing of the auction; and (B) the award of the contract, delivery order, task order, or purchase order to the offeror, in whole or in part, based on the price obtained through the auction process.