Your company has four offices. Each office is configured as an Active Directory site.
You have an Exchange Server 2013 organization that contains nine servers. The servers are
configured as shown in the following table.
A user named User1 is in a distribution group named D_Sales. The mailbox of User1 is in a database
that is active on MBX4 and is configured to use MBX5 as an expansion server.
You need to ensure that email sent to D_Sales from the Internet is received by CAS1, and then
routed from MBX1 to MBX4.
What should you do?
A.
Configure Site1 as a hub site.
B.
Modify the expansion server setting of D_Sales.
C.
Modify the SubmissionServerOverrideList list on MBX1.
D.
Configure Site3 as a hub site.