You have an Exchange Server 2010 Service Pack 1 (SP1) organization. All users access their mailbox
by using Microsoft Outlook 2010. You plan to implement two Client Access servers. You need to
design a Client Access server solution that meets the following requirements:
• Ensures that all of the users can access their mailbox if a Client Access server fails.
• Ensure that all of the users can access their mailbox if a Client Access server service fails.
What should you include in the design? (Choose all that apply.)

A.
a hardware based load balancer

B.
a Client Access array

C.
DNS round robin

D.
a Network Load Balancing cluster

E.
multiple MX records

F.
an SMTP relay