正解:A
Comprehensive and Detailed Explanation:
For a microservices architecture, the most effective way to understand data movement between components is through data flow diagrams (DFDs). DFDs clearly show inputs, outputs, processes, and data stores, helping auditors trace data movement across distributed services.
* Option A: Correct - DFDs highlight application inputs/outputs.
* Option B: Network diagrams show infrastructure but not logical data flows.
* Option C: Business requirements document functional needs, not technical flows.
* Option D: ER diagrams describe database structures, not process flows.
# ISACA Reference: CISA Review Manual 27th Edition, Domain 3, section on system documentation and data flow diagrams in audit analysis.