You are designing an Exchange Server 2010 environment. The environment will include three datacenters, located in Seattle, Dallas, and Miami. Each datacenter will have a separate Active Directory Domain Services (AD DS) site. The Seattle and Miami datacenters will each contain two Mailbox servers. The Dallas datacenter will not contain Mailbox servers. All Mailbox servers will be members of a single database availability group (DAG). You need to recommend the minimum file share witness configuration necessary to ensure that if the Seattle datacenter fails, the DAG will continue to function.

What should you recommend?

A.
No file share witnesses are necessary.

B.
Place one file share witness in the Dallas datacenter.

C.
Place one file share witness in the Seattle datacenter.

D.
Place one file share witness in the Seattle datacenter and one alternate file share witness in the Miami datacenter.