【多选题】
A A proxy PDB must exist in the application root in the local CDB.
B PDB3's application root replica must exist in the local CDB.
C The HR_ROOT replica must exist in the remote CDB.
D A database link must exist in the remote CDB referring to the local CDB.
E A proxy PDB must exist in the application root in the remote CDB.
F A database link must exist in the local CDB root referring to the remote
CDB.
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