Your network consists of a single Active Directory domain named contoso.com. All servers run Windows Server 2003 Service Pack 2 （SP2）. You deploy a Web server named Server1. Users access the server by using the URL http：//server1.contoso.com. You need to create a new resource record that will allow users to access the server by using the URLhttp：//www.contoso.com. The solution must prevent the need to modify the new record if the IP address of Server1 changes. Which type of resource record should you configure？（）
- Aalias（CNAME）
- Bhost（A）
- Cmail exchanger（MX）
- Dpointer（PTR）