Your network contains multiple subnets. On one of the subnets, you deploy a server named Server1 that runs Windows Server 2012 R2. You install the DNS Server server role on Server1, and then you create a standard primary zone named contoso.com. You need to ensure that client computers can resolve IP addresses to host names. What should you do first? A. Create a GlobalNames zone. B. Convert the contoso.com zone to an Active Directory-integrated zone. C. Configure dynamic updates for contoso.com. D. Create a reverse lookup zone.