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 which is configured as a DNS server hosting the DNS primary zone for Domain.com and a computer named CERTKILLER-SR02 in the Paris office configured as a DNS server hosting the DNS secondary zone for Domain.com.
During the course of the day you configure the client computer to use their respective office DNS servers for DNS name resolution. Domain.com has recently requested that you change the IP address of CERTKILLER-SR03 a member server in the London office. Domain.com wants you to ensure that CERTKILLER-SR02 reflects the changes immediately.
What should you do?

A.
You should consider having the dnscmd /zonerefresh command run at the command prompt on CERTKILLER-SR02.

B.
You should consider having the dnscmd /zonerefresh command run at the command prompt on CERTKILLER-SR01.

C.
You should consider having the refresh interval ser to 10 minutes on the Start Of Authority (SOA) record.

D.
You should consider having the DNS Server service restarted on CERTKILLER-SR01.

Explanation:
In order to ensure that CERTKILLER-SR02 reflects the change immediately you need to run the dnscmd command on CERTKILLER-SR01 and use the / zonerefresh option for the command
The dnscmd / zonerefresh option will manually force zone replication on CERTKILLER-SR02
Reference : How can I easily administer DNS servers by using the command prompt? http://www.petri.co.il/dnscmd_command_in_windows_2000_2003.htm