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？（）

• A、Assign the Mailbox Search management role to Group1， and then create a retention policy.
• B、Assign the Mailbox Search management role to Group1， and then create a managed folder mailbox   policy.
• C、Assign the Mailbox Import Export management role to Group1， and then configure Personal     Archivesfor each mailbox.
• D、Assign the Mailbox Import Export management role to Group1， and then instruct Group1 to export     mailboxes to personal folder （.pst） files.