You are setting up a new HTTP application that will be accessible externally via both IPv4 and IPv6 virtual IP addresses, using ports 80, 8080, and 443. Your backends are located in two regions: us-west1 and us-east1. The goal is to serve content with minimal latency while maintaining high availability, autoscaling, and implementing native content-based routing rules based on HTTP hostname and request path. The backends must also see the original client IP addresses. What is the appropriate load balancer configuration for this scenario?