After upgrading the network, as discussed in the case study, the IT manager decides to implement centralized administration between five of its distribution centers and departmental stores in that…

After upgrading the network, as discussed in the case study, the IT manager decides to implement centralized administration between five of its distribution centers and departmental stores in that region. Which of the following technologies should he use to centralize the management and authentication of remote access servers on the network? (Click the Exhibit button on the toolbar to see the case study.)