Your network contains an internal network and a perimeter network. You have one Exchange Server 2010 server on the internal network.

You install Windows Server 2008 R2 on a new server in the perimeter network. You need to ensure that you can install the Edge Transport server role on the new server.

What should you do?

A.
Join the new server to an Active Directory domain.

B.
Install Active Directory Lightweight Directory Services on the new server.

C.
Run ImportEdgeConfig.ps1 on the existing Exchange Server 2010 server.

D.
Open TCP port 389 and TCP port 3268 on the firewall between the perimeter network and the internal network.