Correct Answer: C
The AWS Documentation mentions the following.
The AWS Cost and Usage report tracks your AWS usage and provides estimated charges associated with your AWS account. The report contains line items for each unique combination of AWS product, usage type, and operation that your AWS account uses. You can customize the AWS Cost and Usage report to aggregate the information either by the hour or by the day.
Option A is incorrect since this is just a configuration service.
Option B is incorrect since this is used to check the server for vulnerabilities.
Option D is incorrect since this is used for API monitoring.
For more information on cost usage reports, please visit the below URL-
https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/billing-reports-costusage.html