单项选择题

YouinstalltwoExchangeServer2010ServicePack1（SP1）EdgeTransportserversnamedEdge1andEdge2.Youneedtoensurethate－mailissentonlytoEdge2ifEdge1fails.Whatshouldyoudo？（）

A.CreatetwoCNAMErecordsthathavethesamename.CreateoneMXrecordthatusestheFQDNoftheCNAMErecords.Assignapriorityof0totheMXrecord.
B.CreatetwoMXrecords.AssigntheMXrecordforEdge1apriorityof5.AssigntheMXrecordforEdge2apriorityof1.
C.CreatetwoArecordsthatusethesamename.CreateoneMXrecordthatusestheFQDNoftheArecord.Assignapriorityof0totheMXrecord.
D.CreatetwoMXrecords.AssigntheMXrecordforEdge1apriorityof1.AssigntheMXrecordforEdge2apriorityof5.

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A.JS22
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A.Thismeansthattheclientisreceivingresponsesfromtheserverasfastasitisaskingforthem.Whatisthefirstthingtobechecked？（）
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单项选择题可执行程序的文件后缀名是（）。

A.txt
B.exe
C.obj
D.dll