Which three statements are true about unplugging a pluggable database (PDB)?
A.
A PDB must be in closed state before it can be unplugged.
B.
A PDB must have been opened at least once after creation.
C.
A PDB must be in MOUNT state before it can be unplugged.
D.
PDB data file are automatically removed from disk.
E.
An unplugged PDB can be plugged into the same or another container database (CDB).
Explanation:
A: To unplug a PDB, you first close it.
E: You can disassociate or unplug a PDB from a CDB and reassociate or plug the PDB into the same CDB or into another CDB.
Incorrect Answers:
C: The PDB must be in a closed stated, not in a mounted state when unplugging it.
D: The unplugging operation makes changes in the PDB data files to record that the PDB was properly and successfully unplugged. Because the PDB
is still part of the CDB, you can back it up in Oracle Recovery Manager (Oracle RMAN).
References: http://www.oracle.com/webfolder/technetwork/tutorials/obe/db/12c/r1/pdb/pdb_unplug_plug/pdb_unplug_plug.html