YouhaveanExchangeServer2010organizationnamedcontoso.com.YouhaveaClientAccessservernamedcas1.contoso.comthatisaccessibleontheInternet.Youaccesscas1.contoso.comontheInternetbyusingthefollowingdomainnames：（1）mail.contoso.com（2）autodiscover.contoso.comYouneed
题目
YouhaveanExchangeServer2010organizationnamedcontoso.com.YouhaveaClientAccessservernamedcas1.contoso.comthatisaccessibleontheInternet.Youaccesscas1.contoso.comontheInternetbyusingthefollowingdomainnames：（1）mail.contoso.com（2）autodiscover.contoso.comYouneedtoensurethatmobiledevicescanuseAutodiscoverontheInternet.Whatshouldyoudo？（）
A.SettheexternalURLforMicrosoft-Server-ActiveSyncto$NULL.
B.SettheexternalURLforMicrosoft-Server-ActiveSynctohttps：//cas1.contoso.com/MicrosoftServerActiveSync.
C.SettheexternalURLforMicrosoft-Server-ActiveSynctohttps：//mail.contoso.com/Microsoft-Server-ActiveSync.
D.SettheexternalURLforMicrosoft-Server-ActiveSynctohttp：//autodiscover.contoso.com/Microsoft-Server-ActiveSync.