Explanation
To monitor whether all records were added to the target data structure each day, NTO should use the Notification Settings within the Import File Activity. The Notification Settings allow NTO to specify an email address or a data extension to receive notifications about the status and results of the import. The notifications include information such as the number of records processed, added, updated, skipped, or failed. This way, NTO can track and verify the import process and identify any issues or errors. The other options are incorrect because:
External Key within the Import File Activity. The External Key is a unique identifier for the Import File Activity that can be used for API calls or SQL queries. However, it does not provide any information about the status and results of the import.
Run Completion within the File Drop Automation. The Run Completion is a summary of the execution of the File Drop Automation that shows the start time, end time, duration, and status. However, it does not provide any information about the status and results of the import.
Runtime Error within the File Drop Automation. The Runtime Error is a message that indicates an error occurred during the execution of the File Drop Automation that prevented it from completing successfully. However, it does not provide any information about the status and results of the import.