What must a rental agent have in order to solicit business by phone?

A rental agent is required to have a sales agent's license in order to solicit business by phone. This requirement ensures that the agent is knowledgeable about real estate laws and practices, which protects both clients and the integrity of the real estate profession. Having a sales agent's license indicates that the agent has completed the necessary education, training, and understanding of the legal obligations involved in real estate transactions, including regulations regarding telemarketing and soliciting business.

The other options do not fulfill the legal prerequisites for soliciting business by phone. A business registration does not confer the necessary training or licensing in real estate, while having an unlicensed assistant or a referral agreement does not provide the legal authority to conduct solicitations independently. Therefore, the sales agent's license is the essential credential needed to legally engage in these activities.