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For an application distributed across a large managed instance group, what is the best method to implement a backup/rollback plan?
A
Schedule a cron job to take snapshots of each instance in the group.
B
Use the Rolling Update feature to deploy/roll back versions with different managed instance group templates.
C
Have each instance write critical application data to a Cloud Storage bucket.
D
Use the managed instance group snapshot function that is included in Compute Engine.
