YourcompanyhasamainofficeandfivebranchofficesthatareconnectedbyWANlinks.ThecompanyhasanActiveDirectorydomainnamedcontoso.com.EachbranchofficehasamemberserverconfiguredasaDNSserver.AllbranchofficeDNSservershostasecondaryzoneforcontoso.com.Youneedtoconfigurethecontoso.comzonetoresolveclientqueriesforatleastfourdaysintheeventthataWANlinkfails.Whatshouldyoudo（）
A.ConfiguretheExpiresafteroptionforthecontoso.comzoneto4days.
B.ConfiguretheRetryintervaloptionforthecontoso.comzoneto4days.
C.ConfiguretheRefreshintervaloptionforthecontoso.comzoneto4days.
D.ConfiguretheMinimum（default）TTLoptionforthecontoso.comzoneto4days.
正确答案：参考A
