; (C) establish rules for the registration, formation, oversight, and management of professional standards bodies, including procedures for the regular oversight of such bodies and revocation of their designation; and (D) in consultation with a professional standards body established under subsection (c), define conduct that does not have the purpose or substantial effect of subverting or impairing user autonomy, decision-making, or choice, or of cultivating compulsive usage for children such as— (i) de minimis user interface changes derived from testing consumer preferences, including different styles, layouts, or text, where such changes are not done with the purpose of obtaining user consent or user data; (ii) algorithms or data outputs outside the control of a large online operator or its affiliates; and (iii) establishing default settings that provide enhanced privacy protection to users or otherwise enhance their autonomy and decision-making ability. (4) Safe harbor The Commission may not bring an enforcement action under this Act against any large online operator that relied in good faith on the guidance of a professional standards body.