问题：

[单选]

You are the network administrator for ExamSheet.net. You administer ExamSheet’s Windows 2000 network. You upgrade 10 computers in the Accounting department from Windows NT Workstation 4.0 to Windows 2000 Professional. All of the upgraded computers are configured to have the default security settings. For security purposes you want to ensure that these computers can only communicate with other Windows 2000 computers. 
What should you do？（）

A . On each computer configure separate memory spaces for each financial and credit applications.
B . Apply Highly Secure security template to the local security policy of the computers in the Accounting department.
C . Apply Compatible security template to the local security policy of the computers in the Accounting department.
D . Add each user account to the Power Users group on that user’s computer.