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.