Your network contains a server named Server1 that runs Windows Server 2003 Service Pack 2 （SP2）. Server1 has IPSec enabled. Several users report that they cannot connect to Server1. You need to see how many IPSec connection attempts failed due to authentication failures. What should you do？（）

A. From IP Security Monitor， view the Main Mode Statistics.
B. From Microsoft Baseline Security Analyzer， scan Server1.
C. From the Security event log， view the events from the IPSec source.
D. From System Monitor， add the IPSec V4 Driver ： Active Security Associations counter.