TestKing.com has employed you as their Exchange Administrator. The TestKing.com network contains anExchange Server 2010 Organization. You are responsible for managing the Exchange network forTestKing.com. A TestKing.com policy pertaining to users who no longer works for the company indicates that their useraccounts needs to be disabled and their mailboxes be removed after four months. Any messages in themailboxes have to be kept for a period of two years. You are instructed to recommend a solution that willretain the e-mail messages of employees who leave the company. Your solution needs to meet therequirements below： * The process is managed by a group named HR5 * The disk space needed to store the mailbox database should be reduced. What should you do？（）

A. Your best option would be to assign HR5 the Mailbox Search management role.Thereafter a managed folder mailbox policy should be created.
B. Your best option would be to assign HR5 the Mailbox Import Export management role.Thereafter Personal Archives should be configured for every mailbox.
C. Your best option would be to assign HR5 the Mailbox Import Export management role.Thereafter HR5 should be instructed to export mailboxes to personal folder （.pst） files.
D. Your best option would be to assign HR5 the Mailbox Search management role.Thereafter a retention policy should be created.