Western Governors University (WGU) ITEC3005 D341 Cloud Deployment and Operations Practice Exam

The AWS service responsible for generating billing alarms is CloudWatch. It is a monitoring and observability service that provides data and insights for AWS resources and applications. With CloudWatch, users can set up alarms that will trigger actions based on specified thresholds, including billing metrics. For example, if a user's spending exceeds a budget threshold, CloudWatch can send notifications or trigger other automated actions.

CloudTrail, while essential for logging and monitoring API calls within AWS, does not have billing alarm functionality. Control Tower is a service that helps set up and govern a multi-account AWS environment based on AWS best practices, but it also does not specifically deal with billing alarms. Cost Explorer is a tool designed for viewing and analyzing costs and usage over time but does not provide the capability to generate alarms based on billing thresholds. Thus, CloudWatch plays a central role in monitoring billing metrics and creating alarms based on user-defined criteria.