Which of the following methods effectively removes data from a hard drive prior to disposal？（）

单项选择题ThepowersavingstateinwhichacomputercutspowertoallitsunneededpartsandcopiestheRAMcontenttotheharddriveiscalled（）

A.hibernate
B.shutdown
C.sleep
D.hypervisor

单项选择题Asmallbusinesscurrentlyhasaserverroomwithalargecoolingsystemthatisappropriateforitssize.Thelocationoftheserverroomisthetoplevelofabuilding.Theserverroomisfilledwithincandescentlightingthatneedstocontinuouslystayonforsecuritypurposes.WhichofthefollowingwouldbetheMOSTcost-effectivewayforthecompanytoreducetheserverroomsenergyfootprint？（）

A.Replace all incandescent lighting with energy saving neon lighting.
B.Set an auto-shutoff policy for all the lights in the room to reduce energy consumption after hours.
C.Replace all incandescent lighting with energy saving fluorescent lighting.
D.Consolidate server systems into a lower number of racks，centralizing airflow and cooling in the room.