You are a messaging professional. Your company uses a Microsoft Exchange
Server 2003 messaging system. The existing infrastructure is as shown in the following exhibit. (Refer to the Exhibit)

The front-end servers handle Microsoft Outlook Web Access (OWA), POP3 connectivity, antivirus
filtering, and anti-spam filtering. The company plans to upgrade to a Microsoft Exchange Server 2007
messaging system.

Your company has the following requirements:

The anti-spam filtering and the antivirus filtering must be implemented on the perimeter network.
OWA and POP3 connectivity must not be disrupted during the upgrade.
The servers deployed on the perimeter network must not belong to a Microsoft Active Directory forest.

You need to meet the outlined requirements.

Which three actions should you perform? (Each correct answer presents part of the solution. Choose
three)

A.
Implement Client Access Servers on the perimeter network.

B.
Implement Edge Transport servers on the perimeter network.

C.
Implement a Client Access Server on the internal network.

D.
Implement an Edge Transport server on the internal network.

E.
Implement Microsoft Forefront Security for Exchange on the Edge Transport servers.

F.
Implement Microsoft Forefront Security for Exchange on the Hub Transport servers.