A client who is using AWS cloud services has multiple environments for the EC2 servers like DEV, QA, PROD respectively. The client would like to know billing details for each of these environments to make informed decisions related to saving costs. Using which of the following options the requirements can be achieved?

Answer options:

A.Consolidated billing
B.AWS Budgets
C.AWS Cost allocation tags
D.AWS Organizations

Correct Answer: C
Cost allocation tags appear as additional columns in detailed billing reports. As an example, let`s say an AWS Region has 50 EC2 instances running out of which 15 are DEV, 15 are QA & the remaining are PROD. While launching these instances, one can apply a tag named “env” providing value of DEV for 15 instances, QA for 15 instances and PROD for 20 instances. These tags then appear in a detailed billing report as columns which can be filtered based on the environment and the cost of a set of environment servers calculated easily
Option A is incorrect since consolidated billing is a feature that applies to scenarios where a client has multiple accounts and would like to receive one bill for all his accounts
Option B is incorrect since AWS Budgets are used for setting custom budgets budgeting costs to track costs and usage of resources & get alerted when actual or forecasted cost and usage exceeds the limits set for that budget
Option C is CORRECT. Refer above description for the same.
Option D is incorrect. AWS Organizations allows you to consolidate multiple AWS accounts into an Organization that can be centrally managed for billing. They can have Service Control Policies applied at the organization level that can override policies set up by IAM for individual accounts
Reference:
https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/cost-alloc-tags.html