Explanation

Amazon Athena is the correct AWS service that allows users to use standard SQL to directly query AWS Cost and Usage Report data.

Key Points:

• Amazon Athena is an interactive query service that makes it easy to analyze data in Amazon S3 using standard SQL
• AWS Cost and Usage Reports are stored in Amazon S3 buckets
• Athena can directly query these reports using SQL without the need to load the data into a database
• This enables cost analysis, usage tracking, and financial reporting directly on the billing data

Why other options are incorrect:

• Amazon Aurora: A relational database service, not designed for direct querying of Cost and Usage Reports
• Amazon DynamoDB: A NoSQL database service, not used for querying billing reports
• Amazon CloudWatch: A monitoring service for AWS resources and applications, not for SQL querying of cost data

Amazon Athena provides the serverless, SQL-based querying capability that makes it ideal for analyzing AWS Cost and Usage Report data.