The ORACLE_LOADER access driver is the default. It loads data from external tables to internal tables. The data must come from text data files. (The ORACLE_LOADER access driver cannot perform unloads; that is, it cannot move data from an internal table to an external table.)
The ORACLE_DATAPUMP access driver can perform both loads and unloads. The data must come from binary dump files. Loads to internal tables from external tables are done by fetching from the binary dump files. Unloads from internal tables to external tables are done by populating the binary dump files of the external table. The ORACLE_DATAPUMP access driver can write dump files only as part of creating an external table with the SQL CREATE TABLE AS SELECT statement. Once the dump file is created, it can be read any number of times, but it cannot be modified (that is, no DML operations can be performed).
I think it's D
https://docs.oracle.com/database/121/SUTIL/GUID-ACF1D3AA-1D61-4682-AEC5-42C944756E12.htm#SUTIL1357
The ORACLE_DATAPUMP access driver can perform both loads and unloads ... Unloads from internal tables to external tables are done by populating the binary dump files of the external table
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