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D is corrent because online real-time systems are those for which processing is performed as data are input and the results are available immediately.
A is incorrect because integrated batch processing systems collect data into groups (batches) prior to processing. Then, the entire group of records is processed at regular intervals.
B is incorrect because random access processing is a method of data access (random versus sequential access), not a method of data processing.
C is incorrect because integrated data processing refers to a system (batch or real-time) for which duplicate records and duplicate operations are minimized.