In which two scenarios should you issue the following command？（） FLASHBACK TABLE SCOTT.EMP TO TIMESTAMP SYSTIMESTAP- INTERVAL ’15’ MINUTE；

• A、 when the schema of the user， SCOTT， was deleted by mistake 15 minutes ago
• B、 when the table EMP of the SCOTT schema was dropped by mistake 15 minutes ago
• C、 when some rows of the table， EMP， in the SCOTT schema were deleted by mistake 15 minutes ago
• D、 when some incorrect values were inserted in the EMP table in the user Scott’s schema during the last 15 minutes
• E、 never， because FLASHBACK TABLE is not a valid command in Oracle 10g.