You are the administrator of an Active Directory domain. All servers run Windows Server 2003. All client computers run Windows XP Professional and are members of the domain.The domain contains a single DNS server named Server1. Root hints are enabled on Server1. Internet access for the company is provided by a Network Address Translation （NAT） server named Server2. Server2 is connected to the Internet by means of a permanent connection to the company’s ISP.Users report that they can no longer connect to http：//www.adatum.com. Users can connect to internal resources and to other Internet Web sites. You can successfully access http：//www.adatum.com from a computer outside of the corporate network.You need to ensure that the users can access http：//www.adatum.com. You must also ensure that users retain their ability to access internal resources. Which two actions should you perform？（）

A. Disable Routing and Remote Access on Server2.
B. Create a root zone on Server1.
C. On all affected users’ computers， run the ipconfig /flushdns command.
D. Configure all affected users’ computers to use the ISP’s DNS server.
E. Use the DNS console on Server1 to clear the DNS cache.