You need to design an authentication strategy for the administrators of the IT department to remotely connect to the network. In your solution take care to meet security requirements.
What should you do?

A.
Install Internet Authentication Services (IAS) on a server in the ch.gnbank.com domain.
Configure the VPN servers as RADIUS clients.

B.
Install Internet Authentication Services (IAS) on a stand-alone server in the Chicago extranet. And create local user accounts for the IT personnel on the IAS server.

C.
Create a remote access policy on each of the VPN servers. And configure the policy to use the ch.gnbank.com to authenticate remote access users.

D.
Create a remote access policy on each of the VPN servers. And then configure the policy to require L2TP to establish a connection

E.
Create local user accounts for the IT personnel on the VPN servers.