【单选题】
You are using flat files as the data source for one of your data warehousing applications. To optimize the application performance， you plan to move the data from the flat files to clustered tables in an Oracle database.While migrating the data， you want to have minimal impact on the database performance and optimize the dataload operation. <br /> Which method would you use to load data into the Oracle database（）
A、Use the external table population.
B、Use the Oracle Data Pump export and import utility.
C、Use the conventional path data load of the SQL*Loader utility.
D、Use the INSERT INTO...SELECT command to load the data
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