Your company has a main office and a branch office. The main office has a domain
controller named DC1 that hosts a DNS primary zone. The branch office has a DNS server
named SRV1 that hosts a DNS secondary zone. All client computers are configured to use
their local server for DNS resolution. You change the IP address of an existing server
named SRV2 in the main office. You need to ensure that SRV1 reflects the change
immediately. What should you do?

A.
Restart the DNS Server service on DC1.

B.
Run the dnscmd command by using the /zonerefresh option on DC1.

C.
Run the dnscmd command by using the /zonerefresh option on SRV1.

D.
Set the refresh interval to 10 minutes on the Start of Authority (SOA) record.

Explanation: