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Which statement is true concerning dropping a pluggable database (PDB)?（）
A:The PDB must be open in read-only mode.
B:The PDB must be in mount state.
C:The PDB must be unplugged.
D:The PDB data files are always removed from disk.
E:A dropped PDB can never be plugged back into a multitenant container database (CDB).

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出自：Oracle认证

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