A company named Fabrikam, Ltd. has an Exchange Server 2013 organization that contains two servers.
The servers are configured as shown in the following table.

You configure the internal and external namespaces named mail.fabrikam.com and autodiscover.fabrikam.com
to point to EX2.
You configure Outlook Anywhere on EX1 as shown in the following table.

You configure Outlook Anywhere on EX2 as shown in the following table.

You need to ensure that all of the users on EX1 can connect to their mailbox by using Microsoft Outlook from
the Internet.
What should you do?

A.
Change the authentication settings of EX1.

B.
Disable IPv6 on EX1.

C.
Change the authentication settings of EX2.

D.
Disable Outlook Anywhere on EX1.