When a subscriber unsubscribes from all emails sent from an account
About the other options:
- When a subscriber unsubscribes from a Publication list via an email unsubscribe link : using the unsubscribe link you will have a list level unsubscribe.
-When a subscriber unsubscribes from a list in the Subscription Center: also using Subscription Center, if he unsubscribe from a single list, this is a List Level unsubscribe.
- When a subscriber unsubscribes from all emails sent from the Salesforce Marketing Cloud: in this case we will have a Global Unsubscribe.
