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单项选择题 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

  • A

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