You need to design a configuration for the mailbox servers. What should you do？（）
A. Create two Exchange Server 2003 computers. Place the mailboxes for main office users on one server， and place the mailboxes for remote users on the other server
B. Create a Network Load Balancing cluster that contains two Exchange Server 2003 computers. Place half of the user mailboxes on one server， and place half of the user mailboxes on the other server
Create a Microsoft Cluster Server cluster that contains two Exchange Server 2003 computers. Place all of the user mailboxes on one server and configure the other server as a failover node
D. Create a Microsoft Cluster Server cluster that contains two Exchange Server 2003 computers. Place half of the user mailboxes on one server， and place half of the user mailboxes on the other server
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