Correct Answer – A
AWS Cost Explorer can create user-defined custom forecasts for future usage patterns.
https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/ce-forecast.html
https://aws.amazon.com/about-aws/whats-new/2019/07/usage-based-forecasting-in-aws-cost-explorer/
Option B is INCORRECT because AWS Bills will list the historical costs that would have been incurred over the past month with granular options. The tool will not give the usage-based forecasts as specified in the question.
Option C is INCORRECT because AWS Reports will give a composite overview of costs and usage. The tool gives a granular perspective of usage and billing but without usage-based forecasts.
Option D is INCORRECT because AWS Reports and Cost & Usage Reports are the same tool. Option
C. explanation outlines why it is inaccurate as a response to the question.