You have an Exchange Server 2003 organization.  You plan to transition the organization to Exchange Server 2010.  You need to recommend a plan that allows the Exchange Server 2003 servers to coexist with ExchangeServer 2010 servers.  The plan must meet the following requirements： .Support journaling of e-mail messages that are sent to distribution lists from a mailbox on an ExchangeServer 2003 server .Support journaling of e-mail messages that are sent to distribution lists from a mailbox on an ExchangeServer 2010 server What should you recommend？（）

• A、Implement Personal Archives.
• B、Implement Universal Group Membership Caching.
• C、Use only Exchange Server 2003 servers for the expansion of distribution groups.
• D、Use only Exchange Server 2010 Hub Transport servers for the expansion of distribution groups.