You install a new Exchange Server 2010 server.

You need to ensure that users can connect from the Internet to the server by using Exchange ActiveSync.

What should you do on the Exchange server?

A.
Modify the internal URL for the Microsoft-Server-ActiveSync virtual directory.

B.
Modify the external URL for the Microsoft-Server-ActiveSync virtual directory.

C.
Enable Anonymous Authentication for the Microsoft-Server-ActiveSync virtual directory.

D.
Enable Windows Integrated Authentication for the Microsoft-Server-ActiveSync virtual directory.