Which two statements are true about dropping a pluggable database (PDB)? (Choose two.)

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Which two statements are true about dropping a pluggable database (PDB)? (Choose two.)

A. A PDB must be in mount state or it must be unplugged.
B. The data files associated with a PDB are automatically removed from disk.
C. A dropped and unplugged PDB can be plugged back into the same multitenant container database (CDB) or other CDBs.
D. A PDB must be in closed state. E. The backups associated with a PDB are removed. F. A PDB must have been opened at least once after creation.