Correction, actually, B. there is no "Privacy contact".
https://learn.microsoft.com/en-us/compliance/regulatory/gdpr-breach-office365
"Providing customers with an ability to specify a dedicated privacy contact who will be notified in the event of a breach. Customers can specify this contact using the Privacy reader role settings for Message Center."
"As noted previously, Microsoft 365 is committed to notifying customers within 72 hours of breach declaration. The customer's tenant administrator will be notified. Additionally, Microsoft 365 recommends that customers designate one or more individuals as Message Center Privacy readers, which can be done in the Microsoft 365 admin center. In the event of personal data breach, resources assigned the Message Center Privacy reader role will be able to access the Message center to see relevant privacy notifications and, depending on their Message center preferences, may receive a related email."