You dropped a schema of a user in an Oracle 10g by mistake. You decide to flash the database back to its previous state to restore the deleted schema.  
Which process writes the before images of the physical database blocks to the flashback database logs？（）

A. Query the V$FLASHBACK_DATABASE_LOG view.
B. Query the V$FLASHBACK_DATABASE_STAT view.
C. Check the value of the DB_FLASHBACK_RETENTION_TARGET initialization parameter.
D. Query the V$RECOVERY_FILE_DEST view.

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.

A. The sort area is very small.
B. There is no more space in the Undo tablespace.
C. The flash recovery area is full.
D. The online redo log file is full.