Your company has a set of EC2 Instances in AWS. Senior management wants to know the usage costs for the current set of EC2 Instances and get a clear forecast of the future usage and costs. How can you go about fulfilling this requirement?

Answer options:

A.By using the AWS Trusted Advisor
B.By using the EC2 Explorer
C.By using the Cost Explorer
D.By using the AWS Config tool

Correct Answer: C
The AWS Documentation mentions the following.
AWS provides a free reporting tool called Cost Explorer that enables you to analyze the cost and usage of your EC2 instances and the usage of your Reserved Instances.
Cost Explorer is a free tool that you can use to view charts of your usage and costs. You can view data up to the last 13 months and forecast how much you are likely to spend for the next three months. You can use Cost Explorer to see patterns in how much you spend on AWS resources over time, identify areas that need further inquiry, and see trends that you can use to understand your costs. You also can specify time ranges for the data and view time data by day or by month.
Option A is incorrect because this is a recommendations-based tool in AWS.
Option B is incorrect because this will give the listing of the EC2 resources and the associated costs.
Option D is incorrect because this is a configuration-based tool.
For more information on usage reports, please refer to the below URL-
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/usage-reports.html