【多选题】
A The upgrade can be performed when connected either to cdb$root or to PDB$SEED
B An application name and version number must be specified to upgrade the application
C After an application upgrade, the application containers pdbs remain synchronized with the existing application root
D The upgrade must be performed when connected to CDB$ROOT
E An application root clone gets created automatically
F After an application upgrade, the application containers PDBS are automatically synchronized with the application root clone
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