Your network consists of a single Active Directory domain.You have a Web server named server1.contoso.com that runs Windows Server 2003 Service Pack 2 (SP2). Users access a Web site on Server1 by using the URL http://server1.contoso.com. Users also access the Web site on Server1 by using the URL http://192.168.1.10.You need to configure DNS to enable users to access the Web site by using the URL http://www.contoso.com. The solution must prevent the need to manually update DNS if the IP address of Server1 changes. Which type of resource record should you create in DNS?（）

A. alias (CNAME)
B. host (A)
C. host (AAAA)
D. host information (HINFO)