A large company would like to roll out thin clients to all retail terminals on its next upgrade. Which of the following are potential risks of this IT plan？（）

A. Power consumption；thin clients use more energy than comparable workstations and therefore have a larger energy footprint.
B. Single point of failure；if the thin client server goes down all machines are without functionality.
Centralized administration；IT staff cannot rely on localized group policy settings.
D. High cost of terminals；compared to traditional workstations，thin clients are very expensive and require more maintenance.