Cer-tech .com has a server that runs Windows Server 2008. You have installed the Web Server （IIS） roleon it. Cer-tech plans to host multiple websites on the server. To achieve this you configure a single IPaddress on the server. You also configure all websites to be registered in DNS to point to the single IP address configured on the server. You have to make sure that each and every website responds only to thename requests from all client machines. What should you do to achieve this task？（）

A. Configure the primary and secondary DNS to point to the server’s IP address
B. Configure a network address for each website
C. Assign a unique port for each website
D. Configure and assign a unique Host Header to each website