[单选] You need to maintain a record of all transactions on some tables for at least three years. Automatic undo management is enabled for the database.What must you do accomplish this task?（）

A . Enable supplemental logging for the database.
B . Specify undo retention guarantee for the database
C . Create Flashback Data Archive in the tablespace where the tables are stored.
D . Create Flashback Data Archive and enable Flashback Data Archive for specific table

在不同的历史时期，人们对农业在经济发展中的作用认识有所不同。根据西蒙·库兹涅茨的经典分析，农业对经济发展有四种形式的贡献：即（）贡献、（）贡献、（）贡献和（）贡献。操纵子依据群体成员间关系的亲密程度，社会群体可以分为（）。正式群体。初级群体。次级群体。非正式群体。神经症人格类型，神经证患者为了避免进一步焦虑采用的三种方式（）（）（）根据群体的组织化、正规化程度，社会群体可分为（）。正式群体。初级群体。次级群体。非正式群体。 You need to maintain a record of all transactions on some tables for at least three years. Automatic undo management is enabled for the database.What must you do accomplish this task?（）

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[单选] You need to maintain a record of all transactions on some tables for at least three years. Automatic undo management is enabled for the database.What must you do accomplish this task?（）

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