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.
• C、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.