（单选题）
You want to use the Flashback Transaction Query feature to identify all the changes made to your database within a specific time period. What is a prerequisite for using the Flashback Transaction Query feature？（）
A You must use automatic undo management in the database.
B You must configure OMF in your database.
C You must configure ASM for storing the datafiles.
D You must multiplex the online redo log file.
正确答案
答案解析
略
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