YouhaveanExchangeServer2010organizationnamedcontoso.com.YouhaveaClientAccessservernamedcascontoso.comthatisaccessibleontheInternet.Youaccesscascontoso.comontheInternetbyusingthefollowingdomainnames（1）mail.contoso.com（2）autodiscover.contoso.comYouneedtoensurethatmobiledevicescanuseAutodiscoverontheInternet.Whatshouldyoudo？（）
A.SettheexternalURLforMicrosoft-Server-ActiveSyncto$NULL.
B.SettheexternalURLforMicrosoft-Server-ActiveSynctohttps\/\/cascontoso.com\/MicrosoftServerActiveSync.
C.SettheexternalURLforMicrosoft-Server-ActiveSynctohttps\/\/mail.contoso.com\/Microsoft-Server-ActiveSync.
D.SettheexternalURLforMicrosoft-Server-ActiveSynctohttp\/\/autodiscover.contoso.com\/Microsoft-Server-ActiveSync.
参考答案：C
