Exam 1z0-063 topic 1 question 209 discussion

Examine the statements that use flashback technologies:
1. FLASHBACK TABLE customers TO TIMESTAMP TO_TIMESTAMP (2013-02-04 09:30:00, YYYY-MM-DD HH:MI:SS);
2. SELECT * FROM customers AS OF SCN 123456;
3. FLASHBACK TABLE customers TO BEFORE DROP;
4. FLASHBACK DATABASE TO TIMESTAMP TO_TIMESTAMP (2013-02-04 09:30:00, YYYY-MM-DD HH:MI:SS);
5. SELECT * FROM customers VERSIONS BETWEEM SCN 123456 AND 123999;
6. ALTER TABLE customer FLASHBACK ARCHIVE;
Which set of statements depends on the availability of relevant undo data in the undo tablespace?