A company manages hundreds of AWS accounts in an AWS Organizations organization with all features enabled. The finance team has a daily budget and must receive an email when the organization's AWS costs exceed 80% of that daily budget. Which implementation will track costs and send the required email notification?

AWS Budgets is the most direct and efficient service for tracking AWS costs against a defined budget and sending notifications. Creating a budget in the management account with a daily period and an 80% alert threshold, then linking it to an SNS topic for email notifications, directly addresses all requirements. AWS Trusted Advisor's organizational view focuses on cost optimization recommendations, not real-time budget tracking and alerts. AWS Control Tower guardrails are for policy enforcement and governance, not dynamic cost budget monitoring. While a custom solution involving CUR, Athena, EventBridge, and CloudWatch could work, it's overly complex and requires significant development and maintenance compared to the native functionality of AWS Budgets.