Your network contains an Active Directory forestnamed contoso.com.
The functional levelof the forestis Windows Server 2008 R2.
The DNS zonefor contoso.comis Active Directory-integrated.
You deploya read-only domain controller(RODC) named RODC1.
You install the DNS Server server role on RODC1.
You discover that RODC1 does not have any application directory partitions.
You need to ensure that RODC1 has a directory partitionof contoso.com.
What should you do?

A.
From DNS Manager, create secondary zones.

B.
Run Dnscmd.exe, and specify the/enlistdirectorypartitionparameter.

C.
From DNS Manager, right-click RODC1and click Update Server Data Files.

D.
Run Dnscmd.exeand specify the/createbuiltindirectorypartitionsparameter.

Explanation:
Reference:
http://technet.microsoft.com/en-us/library/cc742490.aspx
RODC Post-Installation Configuration
If you install DNS server after the AD DS installation, you must also enlist the RODC in the DNS application
directory partitions. The RODC is not enlisted automatically in the DNS application directory partitions by
design because it is a privileged operation.If the RODC were allowed to enlist itself, it would have
permissions to add or remove other DNS servers thatare enlisted in the application directory partitions.
To enlist a DNS server in a DNS application directory partition
1. Open an elevated command prompt.
2. At the command prompt, type the following command, and then press ENTER:
dnscmd <ServerName> /EnlistDirectoryPartition <FQDN>
For example, to enlist RODC01 in the domain-wide DNS application directory partition in a domain namedchild.
contoso.com, type the following command:
dnscmd RODC01 /EnlistDirectoryPartition DomainDNSZones.child.contoso.com