(17)DCMs are required to provide a competitive, open, and efficient market and a mechanism for executing transactions that protects the price discovery process of trading in the centralized market of the DCM. Consistent with this requirement, all DCMs utilize central limit order books in which bids and offers are shown. Additionally, DCMs post price quote information on their public websites. SEF transactions involving swaps that are subject to the CFTC's trade execution requirement, which are not block trades, must be executed either in accordance with an Order Book, as defined in the CFTC regulations, or in accordance with a Request-for-Quote System that operates in conjunction with an Order Book. A ‘Request-for-Quote System’ is defined in the CFTC regulations as a trading system or platform in which a market participant transmits a request for a quote to buy or sell a specific instrument to no less than three market participants in the trading system or platform, to which all such market participants may respond. Furthermore, Part 43 of the CFTC's regulations requires a publicly reportable swap transaction to be reported to a CFTC-registered swap data repository (SDR) as soon as technologically practicable after the transaction is executed. For a publicly reportable swap transaction that is executed on or pursuant to the rules of a DCM or SEF, the SDR must ensure that swap transaction and pricing data is publicly disseminated as soon as technologically practicable after such data is received from the DCM or SEF, unless the swap is subject to a time delay. An SDR is required to delay public dissemination of swap transaction and pricing data for publicly reportable swap transactions that exceed certain sizes.