Explanation

AWS Global Accelerator is the correct answer because:

• Traffic Routing: Global Accelerator uses AWS's global network infrastructure to route traffic to the nearest healthy endpoint based on user location
• Performance Improvement: By directing users to the closest available endpoints, it reduces latency and improves application performance
• Availability: It automatically routes traffic to healthy endpoints and provides failover capabilities
• Global Reach: Designed specifically for applications with users in multiple countries/regions

Why other options are incorrect:

• AWS Direct Connect: Provides dedicated network connections to AWS, but doesn't route traffic based on user location
• AWS Well-Architected Tool: Helps review workloads against best practices, but doesn't handle traffic routing
• AWS CLI: Command-line interface for managing AWS services, not a traffic routing service

Global Accelerator is specifically designed for global applications that need improved performance and availability across multiple geographic regions.