Which AWS Cloud service can send alerts to customers if custom spending thresholds are exceeded?

Explanations:

AWS Budgets allows users to set custom spending thresholds and sends alerts when these thresholds are exceeded, making it the right choice for managing budgetary controls and notifications.

AWS Cost Explorer is used for analyzing and visualizing AWS costs and usage over time but does not provide alerts for spending thresholds.

AWS Cost Allocation Tags help categorize and track costs, but they do not provide any functionality for setting alerts on spending thresholds.

AWS Organizations allows management of multiple AWS accounts but does not include features for setting spending alerts or thresholds.