Answer:
Opt-out marketing is the correct answer to the following question.
Step-by-step explanation:
Because Opt-out marketing is that type of the marketing in which any firm or company send Emails to their customers who is register for looking something then, theses company send emails to their customers or the recipients that is relevant to their search on their websites. The customers also unsubscribe them from their mail address if they do not want those emails.