You work as the enterprise exchange administrator at Xxx .The Xxx network consists of a domain named xxx .Xxx is using Microsoft Exchange Server 2010 as their messaging solution. What actions must you take to stop a user named Mia Hamm from removing information from her mailbox？（）

• A、You must use log transactions.
• B、You must use a legal hold.
• C、You must use Outlook Protection Rules.
• D、You must use the Set-Mailbox Mia Hamm -LitigationHoldEnabled $true.