Which of the following is the MOST effective way to detect as many abnormalities as...

A data analytics tool is the most effective way to detect as many abnormalities as possible during an IS audit, as it can process large volumes of data, perform complex calculations, and generate visualizations that reveal patterns, outliers, anomalies, or deviations from expected results. A data analytics tool can also help the auditor to test the entire population of data, rather than a sample, and to perform continuous auditing and monitoring.

References

ISACA CISA Review Manual, 27th Edition, page 256

What is Problem Solving? Steps, Process and Techniques | ASQ

Data Analytics for Auditors - IIA