A research team has a fixed grant split into monthly allocations and wants to be alerted if spending surpasses the planned monthly amount. Which AWS feature will notify them when costs exceed the set amount?

AWS Budgets allows you to set custom budgets to track your costs and usage. You can configure alerts to notify you when your actual or forecasted costs exceed your budgeted amount, making it ideal for monitoring spending against fixed allocations. Cost Explorer is a tool for visualizing and analyzing your costs and usage after they've occurred, but it doesn't proactively alert you based on a set budget. Cost allocation tags are used to organize and categorize your resources and costs, which helps with cost analysis but doesn't provide budget-based alerts. Cost categories are a way to group costs for reporting, similar to tags, and do not offer budget monitoring or alerting functionality.