HOTSPOT
Your network contains an Active Directory domain named contoso.com. All servers run
Windows Server 2012 R2.
The domain contains two domain controllers. The domain controllers are configured as
shown in the following table.
On DC1, you create an Active Directory-integrated zone named Zone1. You verify that
Zone1 replicates to DC2.
You use DNSSEC to sign Zone1.
You discover that the updates to Zone1 fail to replicate to DC2.
You need to ensure that Zone1 replicates to DC2.
What should you configure on DC1?
To answer, select the appropriate tab in the answer area.
Answer: 
Explanation:
Answer = “Zone Transfers” tab
http://technet.microsoft.com/en-us/library/dn593674.aspx
Correct
Just to clarify, this is the relevant text from bobsmith’s link:
In Windows Server 2012 and Windows Server 2012 R2, an RODC loads unsigned zones from Active Directory with no change in functionality from Windows Server 2008 R2. However, if the RODC finds a DNSSEC-signed zone in Active Directory, it does not load the zone as Active Directory-integrated. Instead, it creates a secondary copy of the zone, and then configures the closest writeable domain controller for the domain as the primary server. The RODC then attempts to perform a zone transfer. Zone transfers must be enabled on the primary DNS server for this transfer to succeed. If zone transfers are not enabled, the RODC logs an error event and takes no further action. In this scenario, you must manually enable zone transfers on the primary server that is selected by the RODC. Alternately, you can choose to reconfigure the RODC to point to a different primary DNS server that has zone transfers enabled.
in the zone transfers tab tick the allow box.
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