Explanation

AWS Global Accelerator is the correct answer because:

• Traffic Routing: It uses AWS's global network infrastructure to route user traffic to the closest healthy endpoints based on geographic proximity
• Performance Improvement: By directing users to the nearest AWS edge location, it reduces latency and improves application performance
• High Availability: It automatically routes traffic to healthy endpoints and provides failover capabilities if an endpoint becomes unhealthy
• Global Reach: Designed specifically for applications with users distributed across different countries

Why other options are incorrect:

• AWS Direct Connect: Provides dedicated network connections from on-premises to AWS, but doesn't optimize global traffic routing
• AWS Well-Architected Tool: Helps review workloads against AWS best practices, but doesn't handle traffic routing
• AWS CLI: A command-line interface for managing AWS services, not a traffic routing service

AWS Global Accelerator is specifically designed to improve availability and performance for globally distributed applications by intelligently routing traffic to optimal endpoints.