You work as a network Exchange administrator at Company.com.The Company.com network currently consists of an internal network and perimeter network.The Company.com organization makes use of Microsoft Exchange Server 2010 as their messaging solution.Company.com has recently deployed a new server to the perimeter network which runs Microsoft Windows Server 2008 R2.During the course of the business week you receive instruction from Company.com to install the Microsoft Exchange Server Edge Transport server role on the server in the perimeter network. What should you do？（）

• A、You should consider having the ImportEdgeConfig.ps1 script run on the existing Exchange Server 2010 server.
• B、You should consider having TCP port 88 and TCP port 3268 opened on the firewall between the perimeter network and the internal network.
• C、You should consider having the new server joined to an Active Directory domain.
• D、You should consider having the Active Directory Lightweight Directory Services installed on the new server in the perimeter network.