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.