单选题Which statement is true regarding Flashback Version Query？（）AIt returns versions of rows only within a transaction.BIt can be used in subqueries contained only in a SELECT statement.CIt will return an error if the undo retention time is less than the l
题目
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.