Which three tasks are performed automatically by Database Upgrade Assistant (DBUA) when the database to be upgraded is in archivelog mode and has the database flashback feature enabled? (Choose three.)
A. It changes Oracle kernel parameters if required
B. It creates a restore point to restore the database if the upgrade fails
C. It drops all the invalid objects
D. It calls the catctl.pl script to perform the upgrade process in parallel
E. It automatically resets the COMPATIBLE parameter value to 12.0.0
F. It modifies or creates new tablespaces as required
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