Answer- A. A system that is used to run the business in real-time and is based on historical data
An operational system is used to run the business in real-time based on historical data.
The answer to the question: An operational system is which of the following- is option A. An operational system works based on historical data along with business in real-time. While a subject-oriented database system works on current data. So clearly, we can eliminate options B, and C. Options D cannot be true as an operational system does not function to support decision-making in any manner.
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