"burdensome.\\541\\ CME commented that annual audits of all SEF market participants would be costly and unproductive, and should instead apply at the clearing firm level.\\542\\ MarketAxess recommended that the Commission require a single entity or self-regulatory organization, such as FINRA or NFA, to conduct the audit of each SEF market participant.\\543\\ Tradeweb commented that the proposed annual au" . . . . .