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The EMP table exists in your schema. You want to execute the following query：   SELECT ename， sal FROM emp AS OF TIMESTAMP （SYSTIMESTAMP - INTERVAL ’6’ MINUTE）   WHERE ename = ’ALLEN’；   What are the minimum requirements for the statement to execute successfully？（）
A: ARCHIVELOG mode must be enabled
B: Row Movement must be enabled for the table
C: FLASHBACK must be set to ON for the database
D: The UNDO_MANAGEMENT parameter must be set to AUTO
E: The UNDO_RETENTION parameter must be set appropriately

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出自：Oracle认证

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