You have an Exchange Server 2010 organization. Your companys compliance policy states that the following occurs when a user leaves the company：.The user account is disabled .The user account and mailbox are deleted after six months .All e-mail messages in the mailbox are retained for three years You need to recommend a solution to retain the e-mail messages of users who leave the company.The solution must meet the following requirements： .Ensure that a group named Group1 can manage the process .Minimize disk space required to store the mailbox databases What should you recommend？（）
- AAssign the Mailbox Search management role to Group1， and then create a retention policy.
- BAssign the Mailbox Search management role to Group1， and then create a managed folder mailbox policy.
- CAssign the Mailbox Import Export management role to Group1， and then configure Personal Archives for each mailbox.
- DAssign the Mailbox Import Export management role to Group1， and then instruct Group1 to export mailboxes to personal folder （.pst） files.