What type of opt-in occurs when subscribers are automatically enrolled based on given information?

The correct type of opt-in in this scenario is implicit opt-in. Implicit opt-in refers to the practice where subscribers are automatically included in a mailing list or program based on the information they have provided, such as during an account creation process or by engaging with a service that implies consent. This can occur without an explicit action of affirmatively opting in by the subscriber, like clicking a checkbox.

For instance, when users sign up for a service or complete a form that indicates interest in receiving communications, they may be assumed to have given consent to receive related marketing messages, making it an implicit form of agreement. This form of opt-in is often used in situations where there is a clear connection between the service being offered and the communications being sent.

In contrast, explicit opt-in requires a clear, affirmative action from the subscriber, such as a checkbox that they must click to agree to receive communications. Other types like opt-out refer to processes where users take action to remove themselves from a list after they've been included, and mandatory opt-in suggests that consent is required in a way that may not align with the concept of automatic enrollment based on provided information.