Your company has a main office and five branch offices that are connected by WAN links.
The company has an Active Directory domain named contoso.com.
Each branch office has a member server configured as a DNS server. All branch office DNS
servers host a secondary zone for contoso.com.
You need to configure the contoso.com zone to resolve client queries for at least four days in
the event that a WAN link fails.
What should you do?

A.
Configure the Expires after option for the contoso.com zone to 4 days.

B.
Configure the Retry interval option for the contoso.com zone to 4 days.

C.
Configure the Refresh interval option for the contoso.com zone to 4 days.

D.
Configure the Minimum (default) TTL option for the contoso.com zone to 4 days.

Explanation:
http://technet.microsoft.com/en-us/library/cc816704%28v=ws.10%29.aspx
Adjust the Expire Interval for a Zone
You can use this procedure to adjust the expire interval for a Domain Name System (DNS)
zone. Other DNS servers that are configured to load and host the zone use the expire
interval to determine when zone data expires if it is not successfully transferred. By default,
the expire interval for each zone is set to one day.
You can complete this procedure using either the DNS Manager snap-in or the dnscmd
command-line tool.
To adjust the expire interval for a zone using the Windows interface
1. Open DNS Manager. To open DNS Manager, click Start, point to Administrative Tools,
and then click DNS.
2. In the console tree, right-click the applicable zone, and then click Properties.
3. On the General tab, verify that the zone type is either Primary or Active Directoryintegrated.
4. Click the Start of Authority (SOA) tab.
5. In Expires after, click a time period in minutes, hours, or days, and then type a number in
the text box.
6. Click OK to save the adjusted interval.