You need to design a migration strategy to migrate public folders from the existing Exchange Server 5.5 environment to the Exchange Server 2003 environment. What should you do？（）

A.Use the Migration Wizard to create and migrate mailboxes to Exchange Server 2003
B.Use Active Directory Users and Computers to move user accounts and mailboxes to the new environment
C.Use Microsoft Identity Integration Server （MIIS） to synchronize user accounts with the new environment
D.Use the Active Directory Migration Tool （ADMT） to clone user accounts in Active Directory
E.Use ClonePrincipal to migrate user accounts to the new environment

A.Configure front-end servers to use HTTP to communicate with back-end servers
B.Configure the internal firewall to allow IPSec traffic between front-end and back-end Exchange servers
C.Require all users to encrypt all outbound e-mail messages
D.Issue digital certificates to all remote users. Require the certificates to be used when authenticating to Outlook Web Access

A.Install the antivirus software on each mailbox storage server
B.Install the antivirus software on each Outlook Web Access server
C.Install the antivirus software on one Outlook Web Access server at each office
D.Install the antivirus software on a back-end server that contains no mailboxes