You work as a database administrator for Supportcenter.cn. Your database is configured for automatic undo management. UNDO_RETENTION is set to 3 hours. You want to flash back a table that was created last year. How far back can the flashback query go？（）

• A、3 hours
• B、6 months
• C、until last year
• D、until last commit
• E、until the point when the undotablespacewas refreshed
• F、until the database is shut down and the memory erased