You need to design a strategy for managing the messages that are sent to the customer service mailboxes. What should you do？（）
- ACreate a separate storage group and database to contain the customer service mailboxes. Enable circular logging for this storage group
- BCreate a separate storage group and database to contain the customer service mailboxes. Set the deleted item retention period for this database to zero
- CPlace the customer service mailboxes on a new mailbox store in the storage group that contains the main office user mailboxes. Enable circular logging for this storage group
- DPlace the customer service mailboxes on a new mailbox store in the storage group that contains the branch office user mailboxes. Set the deleted item retention period for this database to zero