Answer: newsletters
Explanation: A newsletter is a written or digital publication that includes information about a company or institution's operations that were sent to their stakeholders, clients, workers or other subscribing parties. Newsletters usually contain each of their users ' key topics of interest.
A newsletter might be regarded as gray literary works. E-newsletters are distributed digitally through e-mail or, if e-mail advertising has been sent unprompted, can be perceived as spam.
Thus, the agent selling specialized property can use this medium as the information will be sent only to interested parties.
