【多选题】
A It requires local UNDO mode in both container databases
B Application PDBS in the application container must be unplugged before the application root is unplugged.
C The application root of an application container should be plugged into the other CDB before its application PDBS are plugged in.
D Unplugging the application root from a CDB unplugs all its application PDBS.
E Plugging the application root into a different CDB plugs in all its application PDBS.
F IT requires only local UNDO mode in the database where the application container will be unplugged
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