Which statement is true regarding Flashback Version Query?

Which statement is true regarding Flashback Version Query?

A.
It returns versions of rows only within a transaction.

B.
It retrieves all versions including the deleted as well as subsequently reinserted versions
of the rows.

C.
It can be used in subqueries contained only in a SELECT statement.

D.
It will return an error if the undo retention time is less than the lower bound time or SCN
specified.