Your network contains an internal network and a perimeter network. You have an Exchange
Server 2003 organization 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.
Install Active Directory Lightweight Directory Services (AD LDS) on the new server.

B.
Open TCP port 25 and TCP port 636 on the firewall between the perimeter network and
the internal network.

C.
Open TCP port 587 and TCP port 3268 on the firewall between the perimeter network
and the internal network.

D.
Install Active Directory Application Mode (ADAM) on the new server.