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 BETWEEN SCN 123456 AND 123999; 6. ALTER TABLE customers FLASHBACK ARCHIVE;
Which set of statements depends on the availability of relevant undo data in the undo tablespace?
A.1,3,6 B.1,2,5 C.3,4,5 D.2,3,5,6正确答案B
