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单项选择题 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.

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