A domain controller named DC4 runs Windows Server 2008 R2. DC4 is configured as a
DNS server for fabrikam.com.
You install the DNS Server server role on a member server named DNS1 and then you
create a standard secondary zone for fabrikam.com. You configure DC4 as the master
server for the zone.
You need to ensure that DNS1 receives zone updates from DC4.
What should you do?

A.
Add the DNS1 computer account to the DNSUpdateProxy group.

B.
On DC4, modify the permissions offabrikam.com zone.

C.
On DNS1, add a conditional forwarder.

D.
On DC4, modify the zone transfer settings for the fabrikam.com zone.

Explanation:
http://technet.microsoft.com/en-us/library/cc771652.aspx
Modify Zone Transfer Settings
You can use the following procedure to control whether a zone will be transferred to other
servers and which servers can receive the zone transfer.
To modify zone transfer settings using the Windows interface
1. Open DNS Manager.
2. Right-click a DNS zone, and then click Properties.
3. On the Zone Transfers tab, do one of the following:
To disable zone transfers, clear the Allow zone transfers check box.
To allow zone transfers, select the Allow zone transfers check box.
4. If you allowed zone transfers, do one of the following:
To allow zone transfers to any server, click To any server.
To allow zone transfers only to the DNS servers that are listed on the Name Servers tab,
click Only to servers listed on the Name Servers tab.
To allow zone transfers only to specific DNS servers, click Only to the following servers, and
then add the IP address of one or more DNS servers.