ToexaminetheExhibit，presstheExhibitbutton.WhileauseriscompilingaCprogram，"vmstat12010"isruntodeterminethecauseofaperformanceproblem.Giventhevmstatoutputasshownintheexhibit，whichofthefollowingconclusionsshouldbedrawnabouttheI/Obottleneck？（）

<img src='https://img2.soutiyun.com/shangxueba/ask/64227001-64230000/64227852/2e751c2e652cec22e734cf25bc5afdcf.jpg' /> A.ThereisafileI/Obottleneck. B.Therearetoomanyopenfiles. C.Thereappearstobeabuffershortage. D.ThereisapagingspaceI/Obottleneck.