Which two actions should you perform?

Your company has offices in Montreal, New York, and Toronto.
Each office is configured as an Active Directory site. The Montreal office has a site link to the New
York office. The New York office has a site link to the Toronto office.
You have an Exchange Server 2013 organization that contains five Mailbox servers. The organization
is configured as shown in the exhibit. (Click the Exhibit button.)

The servers in the Montreal and Toronto offices are members of a database availability group (DAG)
named DAG01. DAG01 contains two databases name TOMBX and MTLMBX.
MTLMBX is active on EX1 and contains all of the mailboxes of the users in the Montreal office.
TOMBX is active on EX3 and contains all of the mailboxes of the users in the Toronto office.
You need to ensure that all email messages transmitted between the Montreal users and the
Toronto users are routed through EX5.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose
two.)

A.
Run the Set-MailboxTransportService cmdlet on EX5.

B.
Make EX5 the source server for all of the Send connectors.

C.
Create a separate DAG for each of the Montreal and Toronto offices.

D.
Add EX5 to DAG01.

E.
Configure the New York office as a hub site.

Explanation:
Routing in Exchange 2013 is now fully aware of Database Availability Groups (DAGs), and uses DAG
membership as a routing boundary.
You use the Set-AdSite cmdlet to specify an Active Directory site as a hub site. Whenever a hub site
exists along the least-cost routing path for message delivery, the messages are queued and are
processed by the Transport service on Mailbox servers in the hub site before they’re relayed to their
ultimate destination.
You can configure any Active Directory site as a hub site. However, for this configuration to work
correctly, you must have at least one Mailbox server in the hub site.