TheUNDO_RETENTIONparameterinyourdatabaseissetto1000andundoretentionisnotguaranteed.Whichstatementregardingretentionofundodataiscorrect?()

A.Undodatabecomesobsoleteafter1，000seconds.

B.Undodatagetsrefreshedafterevery1，000seconds.

C.Undodatawillbestoredpermanentlyafter1，000seconds.

D.Committedundodatawouldberetainedfor1，000secondsiffreeundospaceisavailable.

E.UndodatawillberetainedintheUNDOtablespacefor1，000seconds，thenitgetsmovedtotheTEMPORARYtablespacetoprovidereadconsistency.