Note the following statements that use flashback technology: 1. FLASHBACK TABLE
TO SCN ; 2. SELECT * FROM
AS OF SCN 123456; 3. FLASHBACK TABLE
TO BEFORE DROP; 4. FLASHBACK DATABASE TO TIMESTAMP ; 5. SELECT * FROM
VERSIONS AS OF SCN 123456 AND 123999; Which of these statements will be dependent on the availability of relevant undo data in the undo segment?（） A:1, 2, and 5 B:1, 3, and 4 C:2, 3, 4, and 5 D:1, 2, 3, 4, and 5
出自：Oracle认证
