问题：

[单选]

You are employed as the enterprise exchange administrator at TestKing.com. The TestKing.com networkconsits of a single Active Directory site. TestKing.com makes use of Microsoft Exchange Servermessaging solution.
You are in the process of planning the deployment of Exchange Server 2010. The CIO provides you withthe set criteria needed to deploy the Exchange Server 2010 servers. TestKing.com wants you to ensurethat：
* The Mailbox servers belong to the database availability group （DAG）.
* The users are able to send and receive e-mail in the event of a single server failure.
* The minimization of the amount of servers deployed.
* The load balancing of MAPI connections form Outlook Clients using hardware load balancer.You need to plan the deployment to the Exchange Server 2010 servers to meet the above criteria.
What should you do？（）

A . Your plan should include deploying four servers.The Mailbox server role as well as the Hub Transport server role should be configured on two serversand the Client Access server role on the remaining two.Therafter a Client Access server array should be configured.
B . Your plan should include deploying two servers.The Mailbox server role， the Client Access server role as well as the Hub Transport server role shouldbe configured on the two servers there after a Client Access server array should be configured.
C . Your plan should include deploying four servers.The Mailbox server role should be deployed on two servers and the Client Access server role and theHub Transport server role on the remaining two.Therafter Outlook Anywhere should be enabled on both Client  Accessservers.
D . Your plan should include deploying two servers.The Mailbox serve role， the Client Access server role as well as the Hub Transport server role shouldbe deployed on the two servers.Thereafter Outlook Anywhere should be enabled on both Client Access Servers.