Advertisements by real estate brokers must include which of the following elements?

Advertisements by real estate brokers must include the broker's name and contact information because this is a legal requirement intended to ensure transparency and accountability in real estate transactions. Including this information allows potential clients and consumers to know who they are dealing with, making it easier for them to reach out for inquiries or further assistance. This requirement is part of the effort to protect consumers and maintain ethical standards within the industry.

The other choices, while they may seem relevant, do not meet the standard necessary for real estate advertising regulations. For instance, the agent's commission rate is not typically mandated to be disclosed in advertisements, as it may vary and is often discussed in more private negotiations. The seller's name is also not a requirement since privacy and confidentiality of clients must be respected. Lastly, while a disclaimer on property value might be helpful in certain contexts, it is not a standard requirement in every advertisement. Thus, the inclusion of the broker's name and contact information stands out as the necessary element that upholds consumer trust and regulatory compliance.