单项选择题

Asaresultofperformanceanalysis，youcreatedanindexontheprod_namecolumnoftheprod_dettable，whichcontainsabouttenthousandrows.Later，youupdatedaproductnameinthetable.Howdoesthischangeaffecttheindex？（）

A.Aleafwillbemarkedasinvalid.
B.Anupdateinaleafrowtakesplace.
C.Theindexwillbeupdatedautomaticallyatcommit.
D.Aleafrowintheindexwillbedeletedandinserted.
E.Theindexbecomesinvalidwhenyoumakeanyupdates.
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