A web application generates dynamic content on Amazon EC2 instances in an Auto Scaling group behind an Application Load Balancer (ALB). The company uses CloudFront with the ALB configured as the origin and Route 53 has an A record for www.example.com pointing to the CloudFront distribution. The solutions architect must make the application highly available and fault tolerant across Regions. Which solution meets this requirement?

This solution provides cross-Region high availability and fault tolerance by leveraging CloudFront's origin failover capabilities. By adding a second ALB in a different Region as a new origin to the existing CloudFront distribution and configuring an origin group with primary and secondary origins, CloudFront automatically switches to the secondary origin if the primary becomes unhealthy or unavailable. This ensures continuous service even if an entire AWS Region experiences issues. Incorrect options: Using Route 53 failover records for two CloudFront distributions would work but adds an extra layer of DNS-based failover, which is slower than CloudFront's built-in origin failover. Adding instances from another Region to the existing ALB is not possible as ALBs are Region-specific. While Global Accelerator can improve performance and provide failover, CloudFront's origin group feature directly addresses the requirement for regional failover within the existing CloudFront setup, making it a more direct and often simpler solution for this specific scenario.