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？（）

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.