A SaaS application runs on Amazon EC2 instances in an Auto Scaling group behind a Network Load Balancer (NLB) across three Availability Zones in one Region. The company is deploying the application to additional Regions and must provide static IP addresses to customers (so customers can allowlist them). The solution must automatically route customers to the geographically closest Region. Which solution satisfies these requirements?

AWS Global Accelerator provides static Anycast IP addresses that act as a fixed entry point to your application. It automatically routes users to the closest healthy endpoint, satisfying the requirement for geographic routing and static IPs for allowlisting. A standard accelerator is appropriate here as it optimizes traffic to multiple regional endpoints. Incorrect options: CloudFront is a CDN primarily for caching content, not for providing static IP addresses for direct application access or optimizing non-HTTP/S traffic. While it has edge locations, providing their IP ranges to customers for allowlisting is not a standard or scalable solution, as these IPs can change. A custom routing accelerator in Global Accelerator is designed for applications that need to map users to specific EC2 instances or containers, not for routing to an NLB across regions.