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