Which two statements are true about dropping a pluggable database (PDB)?
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.
Explanation:
http://docs.oracle.com/database/121/ADMIN/cdb_plug.htm#ADMIN13858
AC