Youhaveadatabasewiththefollowingtablespaces：SYSTEM，SYSAUX，UNDO，USERS，TEMP.Youwantto"rollback"thedataintheUSERStablespacetothewayitlookedyesterday.Whichtablespacesdoyouneedtoperformapoint-in-timerestoreoperationoninordertocompletethistask？（）
A.SYSTEM
B.SYSAUX
C.UNDO
D.USERS
E.TEMP
F.Thisrestoreisnotpossible
正确答案：参考A, B, C, D
