Your company has a main office and a branch office.
The network contains an Active Directory domain named contoso.com.
The main office contains a domain controller named DC1 that runs Windows Server 2012 R2. DC1 is
a DNS server and hosts a primary zone for contoso.com. The branch office contains a member server

named Server1 that runs Windows Server 2012 R2. Server1 is a DNS server and hosts a secondary
zone for contoso.com.
The main office connects to the branch office by using an unreliable WAN link.
You need to ensure that Server1 can resolve names in contoso.com if the WAN link in unavailable for
three days.
Which setting should you modify in the start of authority (SOA) record?

A.
Retry interval

B.
Refresh interval

C.
Expires after

D.
Minimum (default) TTL

Explanation:
Used by other DNS servers that are configured to load and host the zone to determine when zone
data expires if it is not renewed