A marketing team is using two systems to send emails. The team wants to maintain unsubscribe information between both of

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A marketing team is using two systems to send emails. The team wants to maintain unsubscribe information between both of the systems.
To remain compliant, they would like to update Marketing Cloud subscription status weekly based on unsubscribes from the other system.
Which solution should they use to maintain subscriber status?

A. Import unsubscribes into a data extension, then update status with a query.
B. Import unsubscribes with the appropriate status into All Subscribers.
C. Create an automation triggered on unsubscribes from the other system.
D. Create a suppression workflow for the unsubscribed accounts.