You have an Exchange Server 2010 organization.  Your companys legal department sends compliance e-mail messages by adding recipients to the blindcarbon copy （Bcc） field.  The companys compliance policy includes the following requirements： .All e-mail messages sent to external recipients must be archived in a central repository .Compliance officers must be able to identify all the recipients of archived e-mail messages You need recommend a solution to meet the compliance policy requirements.  What should you recommend？（）

• A、journal rules
• B、message tracking
• C、Personal Archives
• D、transport rules