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单项选择题 Your company has an Exchange 2010 organization that contains multiple Hub Transport servers. You have a line-of-business application that relays e-mail messages by using a Hub Transport servernamed Hub1. The application only supports sending e-mail to a single SMTP server. You need to ensure that the application can relay e-mail messages if Hub1 fails. What should you do？（）: A、Implement log truncation; B、Install and configure failover clustering on the Hub Transport servers.; C、Implement Windows network load balancing on the Hub Transport servers.; D、Create multiple MX records for the Hub Transport servers in the internal DNS zone.

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