Which option best describes the function of a data flow diagram?

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Data flow diagrams map how data moves through a system—from where it enters, through processing steps, to where it outputs or is stored. That flow-focused view is exactly what the option describing how data is acquired, processed, and output captures. DFDs aren’t primarily about data changing over time (that’s more about history or versioning), nor about auditing for integrity (which is data quality and controls), nor about governance across business units (which is stewardship and policy). So the best description emphasizes the journey of data through the system: acquisition, processing, and output.