; (C) obtain the concurrence of the Commission or the Department of Justice, as appropriate, before granting a request submitted under subparagraph (A); and (D) publish any decision to grant or deny removal of a covered platform designation in the Federal Register. (3) Judicial review Any person operating an online platform that has been designated as a covered platform under paragraph (1) or whose request for removal of such a designation under paragraph (2) is denied may, within 30 days of the issuance of such designation or decision, petition for review of such designation or decision in the United States Court of Appeals for the District of Columbia Circuit. 4. Enforcement guidelines (a) In general Not later than 270 days after the date of enactment of this Act, the Commission and the Department of Justice, in consultation with other relevant Federal agencies and State attorneys general, shall jointly issue agency enforcement guidelines outlining policies and practices relating to conduct that may materially harm competition under section 3(a), agency interpretations of the affirmative defenses under section 3(b), and policies for determining the appropriate amount of a civil penalty to be sought under section 3(c), with the goal of promoting transparency, deterring violations, fostering innovation and procompetitive conduct, and imposing sanctions proportionate to the gravity of individual violations. (b) Updates The Commission and the Department of Justice shall update the joint guidelines issued under subsection (a) as needed to reflect current agency policies and practices, but not less frequently than once every 4 years beginning on the date of enactment of this Act. (c) Public notice and comment Before issuing guidelines, or updates to those guidelines, under this section, the Commission and the Department of Justice shall— (1) publish proposed guidelines in draft form