Which of the following is the MOST effective use of data flow diagrams when implementing...

Data flow diagrams (DFDs) are most valuable for illustrating the locations and movements of personal data across systems and processes, which is essential for compliance mapping and controls. Mapping at rest (C) or transit (D) are subsets of this broader view, while (A) is vague.

“DFDs identify where personal data resides and flows, supporting compliance and risk management.”