A You can use Google Cloud Deployment Manager to create a set of Google Cloud resources and manage them as a unit, called a deployment. For example, if your team's development environment needs two virtual machines (VMs) and a BigQuery database, you can define these resources in a configuration file, and use Deployment Manager to create, change, or delete these resources. You can make the configuration file part of your team's code repository, so that anyone can create the same environment with consistent results. https://cloud.google.com/deployment-manager/docs/quickstart

A. Develop templates for the environment using Cloud Deployment Manager.

A. Infrastructure as Code = Cloud Deployment Manager.

Cloud Deployment Manager is an infrastructure deployment service that automates the creation and management of Google Cloud resources. Write flexible template and configuration files and use them to create deployments that have a variety of Google Cloud services, such as Cloud Storage, Compute Engine, and Cloud SQL, configured to work together. You can use Google Cloud Deployment Manager to create a set of Google Cloud resources and manage them as a unit, called a deployment. https://cloud.google.com/deployment-manager/docs

A seems more correct, u can use the deployement manager to create your instances with the same configurstion file

A. Develop templates for the environment using Cloud Deployment Manager. Although the preferred IaC tool is Terraform. There no mention of Deployment Manager anymore in the Google on-demand courses but there is an entire course on Terraform.

I'm going with A

A is right

Develop templates for the environment using Cloud Deployment Manager.

Templates only

Its A.

A. According to this document https://cloud.google.com/solutions/infrastructure-as-code IaC (Infrastructure as code) tools for Google Cloud: Deployment Manager, Terraform, Puppet, Chef ...

I think A