A.Theiostatcanonlyberunastherootuser
B.TherecouldbezeropercentI\/OwaitandstillbeanI\/Obottleneck
C.AnyI\/OwaittimedisplayedinoutputofiostatisanindicationofsevereI\/Obottlenecks
D.Runningiostatwithoutanyarguments\/parametersissufficientforresolvingI\/Obottlenecks
参考答案：B
