Which of the following is the command that installs Recovery Console on the Boot menu from the Windows 2000 CD？（）

A.installation of an unsigned driver
B.a system crash
C.installation of an application that uses Windows Installer or installation of Shield Pro version 6.0 or later
D.installing an update by using the Windows Update or Automatic Updates
E.each time the system is rebooted

A.Ignore
B.Warn
C.Block
D.Not installed

A.in all cases
B.for some non PnP（non plug and play） device drivers and all PnP（plug and play） device drivers
C.for all non PnP（non plug and play） device drivers and most PnP（plug and play） device drivers
D.not for any non PnP（non plug and play）device drivers,only for all PnP（plug and play） device drivers