According to the text,...

A Windows 7?s Security Center issues warnings from the OS, but the user can turn them off. B although the Action Center does issue alerts, it allows users to deal with them at their convenience. C both the System Tray and the Notification Area are Windows 7?s most positive features. D Windows Vista was the most intrusive OS in all of Windows history. E in the past, Windows did not interrupt users? work to alert them about unused icons on their desktop.