How the data can be read from the output of one or more source programs
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External Source Stage
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External Target Stage
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Complex Flat File Stage
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Internal File Stage
A
Correct answer
Explanation
The External Source Stage is specifically designed to read data output from external programs or processes. It acts as an input source that can consume data generated by source programs running outside DataStage. External Target Stage writes data out, Complex Flat File handles flat files, and Internal File Stage isn't a standard DataStage component.