The correct approach is to modify the existing Ingress resource to add a host rule for the new domain. Google Kubernetes Engine (GKE) uses the Ingress resource to configure the Google Cloud HTTP(S) Load Balancer. A single Ingress can handle multiple hostnames by defining multiple host rules. By updating the existing Ingress (option B), the same load balancer and IP address will route traffic to the appropriate backend services based on the domain name. Creating a new Ingress (options A or D) would result in a separate load balancer with a different IP, which violates the requirement. Option C uses a Service of type LoadBalancer, which creates a network-tier load balancer (not HTTP/S) and does not support host-based routing.