Which of the following is an example of a tactic for subscriber growth?

Online newsletter subscriptions are a strong tactic for subscriber growth because they directly encourage individuals to enter their email addresses in exchange for valuable content. This method not only enhances the size of the email list but also targets an audience that has shown interest in the organization's offerings. By providing an online newsletter, businesses can engage potential subscribers with regular updates, relevant information, and promotional offers, fostering a relationship that encourages ongoing communications and loyalty.

In contrast, mailing physical brochures is less effective for subscriber growth in the digital landscape. While it may raise awareness about services or products, it does not facilitate immediate electronic engagement. One-time event registrations typically yield a temporary list of contacts that may not result in long-term subscriptions unless they are subsequently nurtured through an email follow-up strategy. Telemarketing outreach can generate interest but lacks the ease of subscription and opt-in that digital methods provide, potentially leading to intrusive experiences for potential subscribers.