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Your company infrastructure includes a Windows Server 2008 R2 file server and 1,000 Windows 7 Enterprise client computers. The company wants to require a secure connection between client computers and the file server. You need to create and deploy a Group Policy object (GPO) that includes a rule for Windows Firewall with Advanced Security. What should you do?
Correct Answer: C
Explanation/Reference: Explanation: The PDC emulator master also serves as the machine to which all domain controllers in the domain will synchronise their clocks. It, in turn, should be configured to synchronise to an external NTP time source http://en.wikipedia.org/wiki/Primary_Domain_Controller