You need to ensure that the custom application directory partition replicates to the new domain controller

You have a DNS zone that is stored in a custom application directory partition.
You install a new domain controller.
You need to ensure that the custom application directory partition replicates to the new
domain controller.

What should you use?

A.
the Active Directory Administrative Center console

B.
the Active Directory Sites and Services console

C.
the DNS Manager console

D.
the Dnscmd tool

Explanation:
http://technet.microsoft.com/en-us/library/cc772069.aspx
dnscmd /enlistdirectorypartition Adds the DNS server to the specified directory partition’s
replica set.