单项选择题

A.regionsVALUES(5,’Pole’);COMMIT;TransactionT2UPDATEhr.regionsSETregion_name=’Poles’WHEREregion_id=5;COMMIT;TransactionT3UPDATEhr.regionsSETregion_name=’NorthandSouthPoles’WHEREregion_id=5;YouwanttobackouttransactionT2.Whichoptionwouldyouuse?()
A.Itispossible,buttransactionT3alsobacksout.
B.ItispossiblewiththeNOCASCADE_FORCEoption.
C.ItispossiblewiththeNONCONFLICT_ONLYoption.
D.ItisnotpossiblebecauseithasconflictswithtransactionT3.