Thecurrentdatacenterhasrunoutofspace.Aroomthatislocatednexttotheexistingdatacenteristhenusedtohousetworackscontainingsixservers.Sixmonthslater，physicalhousekeepingisperformedaspartofamid-yearmaintenanceplan.WhichenvironmentalconditiondiscoveredintheroomisLEASTcritical？（）
A.Therearediscoloredceilingtilesnearthemiddleoftheroom.
B.Largeamountsofdusthaveaccumulatedinthecornersoftheroom.
C.Theanti-staticcarpethasbeenremovedresultinginabarepaintedconcretefloor.
D.Awetpipewater-basedsprinklersystemhasbeeninstalledabovetheracks.
参考答案：C
