YouhaveaportablecomputerthatrunsWindows7.Youconfigurethecomputertoentersleepmodeafter10minutesofinactivity.Youdonotusethecomputerfor15minutesanddiscoverthatthecomputerhasnotenteredsleepmode.Youneedtoidentifywhatispreventingthecomputerfromenteringsleepmode.What shouldyoudo?（）
A.Atacommandprompt，runPowercfgenergy.
B.Atacommandprompt，runSysteminfo\/slocalhost.
C.FromPerformanceMonitor，reviewtheSystemSummary.
D.FromPerformanceInformationandTools，reviewthedetailedperformanceandsysteminformation.
参考答案：A
