Your network consists of one Windows Server 2008 domain.
The network contains portable computers.

You configure a server that runs Windows Server 2008 as a Routing and Remote Access Service (RRAS) server.

Users connect remotely to the network through a virtual private network (VPN) connection to the RRAS server from both company-issued portable computers and non- company-issued computers.
The relevant portion of the network is shown in the following diagram:

You need to prepare the environment to secure remote access to the network.

The solution must meet the following requirements:
– Only computers that have Windows Firewall enabled can connect remotely.
– Only computers that have the most up-to-date antivirus definitions can connect remotely.
– Only computers that run Windows Vista and have the most up-to-date updates can connect remotely.

What should you do?

A.
Implement Authorization Manager.

B.
Implement Network Access Protection (NAP) on the perimeter network.

C.
Install a Microsoft Internet Security and Acceleration Server (ISA) 2006 on the network.

D.
Create a domain Group Policy object (GPO). Enable Windows Firewall and publish updated antivirus definitions in the GPO.