You are responsible for creating development environments for your company's development team. You want to create environments with identical IDEs for all developers while ensuring that these environments are not exposed to public networks. You need to choose the most cost-effective solution without impacting developer productivity. What should you do?

A. Create multiple Compute Engine VM instances with a public IP address and use a Public NAT gateway. Configure an instance schedule to shut down the VMs. B. Create multiple Compute Engine VM instances without a public IP address. Configure an instance schedule to shut down the VMs. C. Create a Cloud Workstations private cluster. Create a workstation configuration with an idieTimeour parameter. D. Create a Cloud Workstations private cluster. Create a workstation configuration with a runningTimeout parameter.