A.You should consider running the New Managed Content Settings wizard and creating a new managed folder mailbox policy.Thereafter the policy should be applied to all users.
B.You should consider creating a managed custom folder.Then the New Managed Content Settings wizard should be run and a journal rule created.
C.You should consider having a retention tag created.Then the retention tag should be assigned to a retention policy.Thereafter the retention policy should be applied to all users.
D.You should consider having a retention tag created.Then the retention tag should be assigned to a retention policy. Thereafter a journal rule should be created.