You have a server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2).You open the IP Security Monitor snap-in and see the information shown in the exhibit. (Click the Exhibit button.) You need to ensure that all communications to Server1 are encrypted. What should you do?（）

• A、/Modify the Local Security Policy on Server1. 
• B、Modify the Research IPSec Policy Group Policy object. 
• C、Enable Windows Firewall and do not allow exceptions. 
• D、From the Properties of the Local Area Connection, modify the Authentication settings.