Your company has an Active Directory forest. 
The network contains Exchange Server 2007 Service Pack 1 （SP1） and Exchange Server 2003 ServicePack 2 （SP2） servers. 
All domain controllers run Windows Server 2003 （x86） Service Pack 1 （SP1）. You plan to deploy Exchange Server 2010 on the network. 
You need to recommend changes to the servers so that you can deploy Exchange Server 2010 servers. 
What should you upgrade first？（）

Your network contains an internal network and a perimeter network. The internal network contains an Active Directory forest. The forest contains a single domain. 
You plan to deploy 10 Edge Transport servers on the perimeter network. 
You need to recommend a solution for the Edge Transport server deployment. The solution must meet the following requirements：
.Allow administrators to apply a single security policy to all Edge Transport servers .Reduce the administrative overhead that is required to manage servers .Minimize the attack surface of the internal network 
What should you recommend？（）