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？（）
- AImplement Personal Archives.
- BImplement Universal Group Membership Caching.
- CUse only Exchange Server 2003 servers for the expansion of distribution groups.
- DUse only Exchange Server 2010 Hub Transport servers for the expansion of distribution groups.