Which service provides a report containing line items for each unique combination of AWS products, usage type, and operation in your AWS account?

• A. AWS Cost and Usage Report
• B. AWS Cost Explorer
• C. Savings Plans
• D. Amazon EC2

Answer: (D)

The main thing this question tests is understanding where AWS bills its most granular usage data. The service that provides a report with a line item for every unique combination of AWS product, usage type, and operation is the AWS Cost and Usage Report. This report delivers detailed billing records to an S3 bucket you specify, with each line representing a specific product (service), how the usage is categorized (usage type), and the operation performed. It’s the most detailed source of cost and usage data, which you can then analyze with Athena, Redshift, or your own tooling. You can also include additional fields like resource IDs and tags if you enable them, and schedule the data to arrive daily or monthly.

Cost Explorer, by contrast, offers aggregated, user-friendly views and dashboards of costs and usage, but not the raw, per-line-item data you get from the Cost and Usage Report. Savings Plans are a pricing model, not a reporting source, and Amazon EC2 is a compute service, not a reporting service.