Your company has offices in New York, Paris, and Montreal. An Active Directory site exists for each office.
You have an Exchange Server 2013 organization that contains two servers in each site. One server in each site
has the Mailbox server role installed and the other server in each site has the Client Access server roleinstalled.
You need to ensure that all of the outbound email from each site is routed through the Client Access server in
that site.
Which should you do?

A.
Remove the Mailbox servers from the list of source servers on each Send connector.

B.
Disable the Microsoft Exchange Transport service on each Mailbox server.

C.
Run the Set-SendConnector cmdlet and specify the -FrontendProxyEnabted.True parameter.

D.
Run the Set-TransportConfig cmdlet and specify the -InternatSMTPServers:$nult parameter.

Explanation:
Proxying Outbound Email Through Exchange 2013 Client Access Servers