Which action is NOT permissible while advertising a timeshare?

Offering gifts without a written agreement is not permissible while advertising a timeshare because it can lead to misunderstandings and misrepresentations. Timeshare advertising is regulated to ensure transparency and fairness, and offering gifts in a manner that lacks a formal agreement may imply deceptive practices. This could mislead potential buyers regarding the terms of the offer and the nature of the timeshare itself.

In contrast, the other options relate to practices that are compliant with advertising regulations. Ensuring all promotional offers are disclosed helps maintain honesty and transparency, providing potential buyers with all necessary information to make an informed decision. Obtaining necessary approvals before advertising ensures that all marketing efforts are in line with legal and regulatory requirements, making the process more trustworthy. Using accurate descriptions of properties is crucial for accurately representing the timeshare and preventing potential disputes or legal issues later on.