单项选择题 Aserverneedstohavememoryaddedtosupportanewapplication.ItcurrentlyisusingPC4200 inasinglechannelconfiguration.Whichofthefollowingwouldbethecorrectmemoryupgrade？（）

单项选择题 Which of the following archiving methods only backs up data that has changed since the previous full backup?（）

单项选择题 Whichofthefollowingsoftwaredirectlyinteractswiththehardwareandhandleshardwareresource requestsfromvirtualmachines？（）