Which part outlines the advertisement rules for membership in an institution?

The correct answer is Part 328, which specifically addresses the advertising rules for membership in an institution. This regulation is part of the Federal Deposit Insurance Corporation (FDIC) guidelines that ensure transparency and clarity in how institutions promote themselves and communicate with potential members.

Part 328 outlines the requirements regarding the contents of advertisements, ensuring that they accurately represent the insured status of the institution. It is essential for institutions to convey reliable information about their services and to help consumers make informed decisions regarding their banking options. This part is designed to prevent misleading advertisements that could confuse or deceive the public about the nature of the institution's products and services as well as its insurance status.

The other choices relate to different areas of regulations that do not specifically address advertising rules for membership, focusing instead on other aspects of banking operations and consumer protections.