You need to recommend changes to the Exchange organization of Contoso. The changes must ensure that users can connect to their mailbox if a single Exchange server fails. The solution must meet the business requirements of Contoso. What should you recommend? (Choose all that apply.)
Case Study Title (Case Study): Contoso Ltd Company Overview
Contoso, Ltd. is a wholesale travel agency.
Physical Locations
The company has offices in New York and Seattle. Each office has a call center. All IT staff and help desk staff are located in the New York office.
Existing Environment
Contoso has a single domain named contoso.com. An Active Directory site exists for each office. The sites connect to each other by using a high-speed WAN link. The WAN link has an average utilization rate of 90 percent during business hours.
The domain contains three domain controllers. The domain controllers are configured as shown in the following table.

The network has an Exchange Server 2010 Service Pack 1 (SPl) organization that contains four servers. The servers are configured as shown in the following table.

Each mailbox database is 400 GB.
All of the servers have the following hardware configurations:
-64 GB of RAM
-One dual quad-core Intel Xeon processor
-Two l-gigabit per second Ethernet network adapters
-One RAID 10 disk array that has 12 300-GB, 15,000-RPM SAS disks for data
-one RAID 1 disk array that has two 73-GB, 10,000-RPM SAS disks for program files
-One RAID 1 disk array that has two 73-GB, 10,000-RPM SAS disks for the operating system
Requirements Business Goals
Contoso has the following general requirements that must be considered for all technology deployments:
-Minimize costs whenever possible.
-Minimize administrative effort whenever possible.
-Minimize traffic on the WAN link between the offices.
Planned Changes
Contoso acquires a company named Margie's Travel. Margie's Travel has 3,000 employees.
Margie's Travel has the following email infrastructure:
-A call center, where 200 employees work
-UNIX-based email hosts that users access by using POP3 and SMTP
-Three departments that use the SMTP domains of margiestravel.com, east.margiestravel.com,
-and blueyonderairlinesxam. Users are assigned only one email address that uses the SMTP domain of their department
You plan to deploy a new Exchange Server 2010 SP1 organization to Margie's Travel. The new email infrastructure must meet the following implementation requirements:
-All employees must have access to their mailbox if a single server fails.
-Call center employees must use windows Internet Explorer 8 to access their mailbox.
-The administration of the Margie's Travel Exchange organization must be performed by a dedicated team.
-Call center employees must be prevented from accessing the calendar or journal features of Outlook Web App.
-All employees who do not work in the call center must have access to all of the Outlook web App
features.
-All email messages sent to recipients outside of Margie's Travel must have a return address in the [email protected] format.
The new email infrastructure for Margie's Travel must meet the following security requirements:
-Contoso administrators must be prevented from viewing or modifying the settings of the mailboxes of Margie's Travel users.
-All inbound and outbound Internet email to and from the Margie's Travel domains must be routed
through the Hub Transport servers of Contoso.
-All email messages that contain confidential customer information must be encrypted automatically while in transit and the recipients of the messages must be prevented from forwarding them to other users.
Compliance Requirements
Contoso must meet the following compliance requirements:
-Each email message sent by an attorney from the Contoso legal department must be approved by the manager of the legal department.
-Attorneys must be able to classify email messages as "attorney-client privileged".
-All messages classified as "attorney-client privileged" must contain a legal disclaimer automatically.
User Requirements
All users who have a portable computer use Microsoft Outlook 2010 when they work online and offline.
When the users work offline, they must be able to read existing email messages and create new email
messages.
Users who have a large mailbox must minimize the amount of hard disk space used by the mailbox on their
portable computer.

• A. Create a Network Load Balancing cluster in each site. Create a Client Access array in each site.
• B. Create a database availability group (DAG) for each site. Add the Mailbox servers of each site to the respective DAG. Create two database copies of each mailbox database.
• C. Create a database availability group (DAG) that contains all of the Mailbox servers. Create four database copies of each mailbox database.
• D. Deploy an alternate file share witness to each Mailbox server and enable Datacenter Activation Coordination (DAC) mode.
• E. Deploy a new hardware load balancer to each site and create a Client Access array in each site.