Your company wants to understand where the cost is coming from in the company’s production AWS account. There are several applications and services running at any given time. Without expending too much initial development time, how can you give the business a good understanding of which applications cost the most per month to operate?

Answer options:

A.Create an automation script that periodically creates AWS Support tickets requesting detailed intra-month information about your bill.
B.Use custom CloudWatch Metrics in your system, and put a metric data point whenever cost is incurred.
C.Use AWS Cost Allocation Tagging for all resources which support it. Use the Cost Explorer to analyze costs throughout the month.
D.Use the AWS Price API and constantly running resource inventory scripts to calculate total price based on multiplication of consumedresources over time.

Answer – C
A tag is a label that you or AWS assigns to an AWS resource. Each tag consists of a key and a value. A key can have more than one value. You can use tags to organize your resources, and cost allocation tags to track your AWS costs on a detailed level. After you activate cost allocation tags, AWS uses the cost allocation tags to organize your resource costs on your cost allocation report to make it easier for you to categorize and track your AWS costs. AWS provides two types of cost allocation tags, an AWS-generated tag and user-defined tags. AWS defines, creates, and applies the AWS-generated tag for you, and you define, create, and apply user-defined tags. You must activate both types of tags separately before they can appear in Cost Explorer or on a cost allocation report.
For more information on Cost Allocation tags, please visit the below URL:
http://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/cost-alloc-tags.html