Your network consists of a single Active Directory site. You plan to deploy Exchange Server 2010.  You need to plan the deployment of Exchange Server 2010 servers to meet the following requirements：.All Mailbox servers must belong to a database availability group （DAG） .MAPI connections from Outlook clients must be load balanced by using a hardware load balancer .If a single server fails， users must continue to send and receive e-mail .The plan must minimize the number of servers deployed  What should you include in the plan？（）

• A、Deploy two servers. On the two servers， deploy the Mailbox server role， the Client Access server role， and the HubTransport server role. Configure a Client Access server array.
• B、Deploy two servers. On the two servers， deploy the Mailbox server role， the Client Access Server role， and the HubTransport server role. Enable Outlook Anywhere on both Client Access servers.
• C、Deploy four servers. On two of the servers， deploy the Mailbox server role and the Hub Transport server role. On the other two servers， deploy the Client Access server role. Configure a Client Access server array.
• D、Deploy four servers. On two of the servers， deploy the Mailbox server role. On the other two servers， deploy the Client Access server role and the Hub Transport server role. Enable Outlook Anywhere on both Client Access servers.