DatafileDF1belongstotablespaceTS1.，andthedatabaseisinARCHIVELOGmode.Youdidanincompleterecoverinthefollowingsteps：1.TakedatafileDF1offline.2.CopyabackupcopyofDF1intothecurrentDF1location.3.ExecuteRECOVERDATAFILEUNTILTIMEsometimeinthepast.4.BringDF1online.5.ExecuteALTERDATABASEOPENRESETLOGS.Toguaranteethatthedatabaseisrecoverableinthefuture，whatistheleastamountofworkneeded？（）

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