Which of the following DAG design solutions should you use?

You work as a Systems Administrator at ABC.com. The ABC.com network consists of an Active
Directory Domain Services (AD DS) domain named ABC.com. All servers run Windows Server
2012 and all client computers run Windows 8 Pro.
The company has an office in New York and an office in Boston. Each office is configured as an
Active Directory site. The two offices are connected by a WAN link. The latency of the WAN link
is more than 800ms.
You are planning the deployment of Exchange Server 2013.

You plan to configure four Exchange 2013 servers. All four servers will run both the Mailbox
Server role and the Client Access server role.
Two servers in the New York office will be named NY-EX1 and NY-EX2.
Two servers in the Boston office will be named Bos-EX1 and Box-EX2.
The New York office has a file server named NY-File1 and the Boston office has a file server named Bos-File1.
You need to design a Database Availability Group (DAG) solution to ensure that all users can
access their mailbox if either a single server fails or a single database fails or the WAN link fails.
Which of the following DAG design solutions should you use?

You work as a Systems Administrator at ABC.com. The ABC.com network consists of an Active
Directory Domain Services (AD DS) domain named ABC.com. All servers run Windows Server
2012 and all client computers run Windows 8 Pro.
The company has an office in New York and an office in Boston. Each office is configured as an
Active Directory site. The two offices are connected by a WAN link. The latency of the WAN link
is more than 800ms.
You are planning the deployment of Exchange Server 2013.

You plan to configure four Exchange 2013 servers. All four servers will run both the Mailbox
Server role and the Client Access server role.
Two servers in the New York office will be named NY-EX1 and NY-EX2.
Two servers in the Boston office will be named Bos-EX1 and Box-EX2.
The New York office has a file server named NY-File1 and the Boston office has a file server named Bos-File1.
You need to design a Database Availability Group (DAG) solution to ensure that all users can
access their mailbox if either a single server fails or a single database fails or the WAN link fails.
Which of the following DAG design solutions should you use?

A.
Two DAGs. A DAG named NY-DAG in New York using NY-EX1 and NY-EX2 with NY-File1 as
a witness server. A second DAG named Bos-DAG in Boston using Bos -EX1 and Bos -EX2 with
Bos -File1 as a witness server.

B.
Two DAGs. A DAG named DAG1 using NY-EX1 and Bos-EX1 with NY-File1 as a witness
server. A second DAG named DAG2 using NY-EX2 and Bos-EX2 with Bos-File1 as a witness
server.

C.
One DAG. A single DAG using NY-EX1, NY-EX2, Bos-EX1 and Bos-EX2 with NY-File1 as a
witness server.

D.
One DAG. A single DAG using NY-EX1, NY-EX2, Bos-EX1 and Bos-EX2 with NY-File1 and
Bos-File1 as witness servers.

E.
One DAG. A single DAG using NY-EX1, NY-EX2, Bos-EX1 and Bos-EX2 with no witness
servers.