Your network contains two data centers named Datacenter1 and Datacenter2. An Active Directory site exists for each data center. 
The data centers connect to the Internet by using a direct link. 
The data centers connect to each other by using a high-speed WAN link. 
You plan to deploy Exchange Server 2010 Mailbox servers in both data centers. You need to plan message routing to meet the following requirements：.Ensure outbound delivery of e-mail messages if a single server fails .Automatically load balance the Hub Transport server in each site .Deploy the minimum number of servers
What should you include in the plan？（）

You have an Exchange Server 2010 organization that consists of 50 Exchange Server 2010 servers. Your companys security policy states that approved Exchange and Windows Server patches and securityupdates must be applied to all Exchange servers within one week of being released. 
You need to recommend a patch management solution that meets the following requirements： .Allow administrators to manually approve patches and security updates .Allow only the installation of approved patches and security updates 
.Minimize the administrative effort to deploy patches .Minimize the deployment costs
What should you include in the solution？（）