Which of the following technologies allows a single piece of hardware to host multiple operating systems simultaneously？（）

单项选择题Whichofthefollowingwouldacompanyimplementtohelpreducethecostofelectricity？（）

A.Shutdown/power policies
B.Redundant power supplies
C.Use optical mice
D.Social engineering policy

单项选择题Whichofthefollowingneedstoberecycledduetodangerousamountsofgascontainedinsideitshousing？（）

A.CRT
B.Toner
C.Surge suppressor
D.LCD