Examine the following impdp command to import a database over the network from a pre-12c Oracledatabase (source): Which three are prerequisites for successful execution of the command?（）
- A The import operation must be performed by a user on the target database with the DATAPUMP_IMP_FULL_DATABASE role, and the database link must connect to a user on the source database with the DATAPUMP_EXD_FULL_DATABASE role.
- B All the user-defined tablespaces must be in read-only mode on the source database.
- C The export dump file must be created before starting the import on the target database.
- D The source and target database must be running on the same platform with the same endianness.
- E The path of data files on the target database must be the same as that on the source database.
- F The impdp operation must be performed by the same user that performed the expdp operation.