You have an Exchange Server 2010 organization named contoso.com.
You have a Client Access server named cas1.contoso.com that is accessible on the Internet.
. You access cas1.contoso.com on the Internet by using the following domain names:
. mail.contoso.com
. autodiscover.contoso.com
You need to ensure that mobile devices can use Autodiscover on the Internet.
What should you do?
A. Set the external URL for Microsoft-Server-ActiveSync to $NULL.
B. Set the external URL for Microsoft-Server-ActiveSync to https://cas1.contoso.com/MicrosoftServerActiveSync.
C. Set the external URL for Microsoft-Server-ActiveSync to https://mail.contoso.com /Microsoft-Server-ActiveSync.
D. Set the external URL for Microsoft-Server-ActiveSync to http://autodiscover.contoso.com/Microsoft-Server-ActiveSync.
