（单选题）
Which statement is true regarding Flashback Version Query？（）
A It returns versions of rows only within a transaction.
B It can be used in subqueries contained only in a SELECT statement.
C It will return an error if the undo retention time is less than the lower bound time or SCN specified.
D It retrieves all versions including the deleted as well as subsequently reinserted versions of the rows.
正确答案
答案解析
略
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