单项选择题

A.YourpartnercompanyhasaDNSservernamedServer2.YoucreateastubzoneonServer1.ThemasterforthestubzoneisServer2.Server2fails.Youdiscoverthatusersarenotabletoresolvenamesforthepartnercompany.YouneedtoensurethatusersareabletoresolvenamesforthepartnercompanyintheeventthatServer2fails.Whatshouldyoudo?()
A.ChangethestubzonetoasecondaryzoneonServer1
B.OpentheSOArecordforthezoneonServer2.ChangetheMinimum(default)TTLsettingto12hours.
C.OpentheDNSzoneforthepartnercompanyonServer2.CreateanewRouteThrough(RT)recordandanewhost(A)recordforServer1.
D.OpentheprimaryDNSzoneonServer2.CreateanewServiceLocator(SRV)recordandanewhost(A)recordforServer1.