（单选题）
Before a Flashback Table operation，you execute the following command： ALTER TABLE employees ENABLE ROW MOVEMENT； Why would you need this to be executed？（）
A Because row IDs may change during the flashback operation
B Because the object number changes after the flashback operation
C Because the rows are retrieved from the recycle bin during the flashback operation
D Because the table is moved forward and back to a temporary during the flashback opertion
正确答案
答案解析
略
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