You work as a network exchange administrator at Company.com.the Company.com network currently consists of a single active directory forest containing a single domain named Company.com.the Company.com organization makes use of microsoft exchange server 2010 as their messaging  solution.Company.com has recently configured an exchange server named ex01 with a single mailbox database.Company.com is aware that the network users user microsoft office outlook and outlook web app.During your routine maintenance you discover that the network users are unable to restore e-mail messages from the Recover Deleted Items folder. During the course of the business week you receive instruction from Company.com to ensure that the network users are able to restore e-mail messages from the Recover Deleted Items folder. What should you do？（）

• A、You should consider having a management role created and assigned to all users from the Exchange Management Shell.
• B、You should consider having a retention policy created and assigned to all users from the Exchange Management Shell.
• C、You should consider having the properties of the mailbox database modified from the Exchange Management Console （EMC）.
• D、You should consider having the properties of the Mailbox server object modified from the Exchange Management Console （EMC）.