【多选题】
A Data file 24 can be recovered while PDB2 is opened.
B Data file 24 cannot be recovered while the CDB is opened
C Data file 24 must be recovered while PDB2 is closed.
D Data file 24 must be recovered while the CDB is opened.
E Data file 24 can be recovered while CDB$ROOR and PDB$SEED are opened
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