Your company has a main office and two branch offices that are connected by WAN links. The main office runs the DNS Server service on three domain controllers. The zone for your domain is configured as an Active Directory-integrated zone. Each branch office has a single member server that hosts a secondary zone for the domain. The DNS servers in the branch offices use the main office DNS server as the DNS Master server for the zone. You need to minimize DNS zone transfer traffic over the WAN links. What should you do？（）

• A、Decrease the Retry Interval setting in the Start of Authority (SOA) record for the zone.
• B、Decrease the Refresh Interval setting in the Start of Authority (SOA) record for the zone.
• C、Increase the Refresh Interval setting in the Start of Authority (SOA) record for the zone.
• D、Disable the netmask ordering option in the properties of the DNS Master server for the zone.