You have a DNS zone that is stored in a custom application partition.
You need to add a domain controller to the replication scope of the custom application
partition.
Which tool should you use?

A.
DNScmd

B.
DNS Manager

C.
Server Manager

D.
Dsmod

Explanation:
http://technet.microsoft.com/en-us/library/cc753801.aspx
After you create a Domain Name System (DNS) application directory partition to store a
zone, you must enlist the DNS server that hosts the zone in the application directory
partition.
To enlist a DNS server in a DNS application directory partition
1. Open a command prompt.
2. Type the following command, and then press ENTER: dnscmd <ServerName> /
EnlistDirectoryPartition <FQDN>