Test learners' ability to apply Chevron deference, the major questions doctrine, and arbitrary-and-capricious (APA) review to evaluate the legality of federal agency regulations governing digital platforms. Items will require identifying statutory ambiguity, deciding whether an agency interpretation merits Chevron deference or is foreclosed by the major questions doctrine (drawing on Chevron, West Virginia v. EPA, and related precedent), and assessing whether an agency engaged in reasoned decision-making supported by the administrative record (e.g., Motor Vehicle Mfrs. v. State Farm). Fact patterns will cover content moderation, data practices, algorithmic governance, and platform competition; learners must select and apply the correct legal standard, predict likely judicial outcomes, and identify potential remedies.