A . HKEY_LOCAL_MACHINEHardwareDescriptionSystem
B . HKEY_LOCAL_MACHINESoftwareMicrosoftDfrgBootOptimizeFunction
C . HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionDateTimeServers
D . HKEY_CURRENT_USER\SoftwareMicrosoftWindowsCurrentVersionExplorerAdvanced