You have an Active Directory domain named contoso.local. You plan to deploy an Exchange Server
2010 organization that will contain the following server:
• Two Edge Transport servers named Edge1.contoso.com and Edge2.contoso.com
• Two Hub Transport servers named hub1.contoso.local and hub2.contoso.local
You need to design a solution that ensures that e-mail messages from the Internet can be delivered
to internal recipients if a single Edge Transport server fails. What should you include in the design?

A.
two Remote Domains

B.
two SRV resource records

C.
two EdgeSync Subscriptions

D.
two mail exchange (MX) records