You deploy a mobile messaging infrastructure with front-end and back-end Microsoft Exchange Server 2003 servers. Both servers have Service Pack 2 installed.   Company security policy requires that all information from the Exchange Server 2003 servers must be encrypted.   You need to audit the mobile messaging infrastructure to verify that it complies with company security policy.  What should you do?（）

• A、A
• B、B
• C、C
• D、D