To view a breakdown of an organization's credit usage for storage for the past 90 days, which action should the ArcGIS Online administrator take?

The correct action is to select the date range and review the Credit Utilization Chart. This option allows the ArcGIS Online administrator to visualize the organization's credit usage over the specified time frame, showing how credits have been consumed specifically for storage in the last 90 days. The Credit Utilization Chart gives a graphical representation, making it easier to identify trends, peaks, or unusual activities in credit usage concerning storage.

Reviewing this chart provides immediate insights into usage patterns without needing to sift through detailed reports or summaries, which might not provide the clarity an administrator needs for quick decision-making. The visual format can highlight areas where usage is high or any discrepancies that require further investigation. Analyzing the utilization over the past 90 days is crucial for effective resource management and planning.

Options that involve generating reports or summaries are valuable but may not deliver the same level of immediate visual feedback as the chart does, which is essential for quick analysis.