Which type of token is used to timestamp when a person unsubscribes?

The correct answer is that the timestamp when a person unsubscribes is captured using a system token. System tokens provide predefined values and information that apply universally across the Marketo instance. They are designed to reflect the platform's internal processes and data, including subscriber status changes.

When a contact unsubscribes, Marketo generates a timestamp indicating this event, and it is stored as a system token. This allows users to access this specific piece of information easily in email templates or reporting without the need for custom coding or configuration.

Person tokens are specific to individual contacts and reflect their personal attributes, while campaign and program tokens are associated with specific campaign or program contexts and do not encompass universal system-level events like unsubscribe timestamps. Hence, system tokens are the appropriate choice for capturing core system events like unsubscribes.