【多选题】
A It fails because PDBSSEED is in MIGRATE state
B It fails because PDB2 is not in UPGRADE state
C Only CDB$ROOT, PDB$SEED, and PDB2 are upgraded.
D Only CDB$ROOT and PDB$SEED are upgraded.
E CDB$ROOT, PDB$SEED, PDB1, and PDB2 are upgraded
F Only CDB$ROOT, PDB$SEED, and PDB1 are upgraded
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