You need to design a strategy for managing the messages that are sent to the customer service mailboxes. What should you do？（）

• A、Create a separate storage group and database to contain the customer service mailboxes. Enable circular logging for this storage group
• B、Create a separate storage group and database to contain the customer service mailboxes. Set the deleted item retention period for this database to zero
• C、Place 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
• D、Place 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