You are developing a web application that will be accessible over both HTTP and HTTPS and will run on Compute Engine instances. On occasion, you will need to SSH from your remote laptop into one of the Compute Engine instances to conduct maintenance on the app. How should you configure the instances while following Google-recommended best practices?

【单选题】
A Set up a backend with Compute Engine web server instances with a private IP address behind a TCP proxy load balancer.
B Configure the firewall rules to allow all ingress trafic to connect to the Compute Engine web servers, with each server having a unique external IP address.
C Configure Cloud Identity-Aware Proxy API for SSH access. Then configure the Compute Engine servers with private IP addresses behind an HTTP(s) load balancer for the application web trafic.
D Set up a backend with Compute Engine web server instances with a private IP address behind an HTTP(S) load balancer. Set up a bastion host with a public IP address and open firewall ports. Connect to the web instances using the bastion host

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