Which of the following is necessary for all advertising done by teams?

In the context of advertising done by real estate teams, it is essential to include the firm's name in all advertising materials. This requirement is based on regulations designed to ensure transparency and proper identification of the brokerage. Including the firm's name helps to maintain accountability and allows consumers to verify the legitimacy of the advertisement. This practice aligns with industry standards and legal requirements, as it clearly indicates which firm is responsible for the services being advertised.

While listing team members, obtaining state approval, and offering advertisements in multiple languages might be relevant in certain contexts or beneficial for marketing purposes, they are not universally mandated for all team advertising. The critical emphasis on including the firm's name underscores the need for adherence to regulatory guidelines, serving as a safeguard for both consumers and the professional standards of real estate practice.