A company launching an ecommerce site with a large product image catalog needs to track and control ongoing costs to stay within budget. Which AWS service should they use to monitor and analyze costs?

AWS Cost Explorer is the correct choice because it provides a user-friendly interface to visualize, understand, and manage AWS costs and usage over time. It allows you to analyze your spending patterns, identify cost drivers, and forecast future costs, which is crucial for staying within budget for an ecommerce site with a large image catalog. AWS SDKs are developer toolkits for interacting with AWS services programmatically, not for cost analysis. EC2 Image Builder is for automating the creation, management, and deployment of customized server images, unrelated to cost monitoring. AWS CloudFormation is an infrastructure as code service for provisioning and managing AWS resources, not for analyzing ongoing costs.