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单选题
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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