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.