You work as the network administrator at Domain.com. The Domain.com network consists of a single Active Directory domain named Domain.com. Domain.com has its headquarters located in London and branch office located in Paris. All servers on the Domain.com network run Windows Server 2008 and all client computers run Windows Vista. Domain.com currently makes use of a computer named CERTKILLER-SR01 in the London office and CERTKILLER-SR02 in the Paris office both servers configured as Read-Only Domain Controllers (RODC) running DNS.
Domain.com as additionally configured the servers in both offices to have Active Directory- integrated DNS zones configured. During the course of the day you receive instruction from Domain.com to ensure that all the client computers are configured to use their local DNS servers for name resolution whilst ensuring that the changes are immediately reflected at the Paris office DNS server when you change the IP address of CERTKILLER-SR01 in the London office.
What should you do?

A.
You should consider having the standard domain controllers used at the Paris office instead of ththe Read-Only Domain Controller (RODC) server.

B.
You should consider having the Minimum (default) TTL option decreased to 15 minutes on the Start of Authority (SOA) record for the zone.

C.
You should consider having the dnscmd /ZoneUpdateFromDs command run at the command prompt on a domain controller in the London office

D.
You should consider having the dnscmd /ZoneUpdateFromDs command run at the command prompt on the Paris office servers.

Explanation:
In order to reflect the change immediately, you need to run the dnscmd / ZoneUpdateFromDs command on the branch office servers. This command updates the specified ActiveDirectory- integrated zone from ADDS.
Reference : dnscmd / zoneupdatefromds
http://technet2.microsoft.com/windowsserver2008/en/library/e7f31cb5-a426-4e25-b714- 88712b8defd51033.mspx?mfr=true