An engineering team wants email notifications when its monthly AWS costs exceed a configured amount or are forecast to exceed that amount. The notifications should not require the team to inspect a report manually. Which service is the best fit?

1. CloudTrail event history, configured to send an email for every API call.
2. AWS Config rules that automatically calculate all future monthly charges from resource tags.
3. AWS Budgets with actual-cost and forecasted-cost notification thresholds and the team's email subscribers.
4. A Cost Explorer chart that is never viewed and has no notification mechanism.