To serve traffic on https://www.example.com, you must first own the domain example.com, which can be registered using Google Domains. After owning the domain, you need to create a DNS zone for www.example.com using Cloud DNS, a scalable and managed authoritative DNS service. Within Cloud DNS, you should create an A record pointing to the public IP of your load balancer. For fronting the autoscaled managed instances group, Google recommends using an HTTP(S) Load Balancer, as it is designed for HTTP(S) traffic, unlike the SSL Proxy Load Balancer which is intended for non-HTTP(S) traffic. Therefore, the correct combination of services is Google Domains, Cloud DNS, and HTTP(S) Load Balancer.