You need a dynamic way of provisioning VMs on Compute Engine. The exact specifications will be in a dedicated configuration file. You want to follow Google's recommended practices. Which method should you use?
The correct answer is Option A - Deployment Manager. Deployment Manager is a configuration management tool that allows you to define and deploy a set of resources, including Compute Engine VMs, in a declarative manner. You can use it to specify the exact specifications of your VMs in a configuration file, and Deployment Manager will create and manage those VMs for you. Deployment Manager is recommended by Google as a way to automate and manage the deployment of resources on the Google Cloud Platform.
https://cloud.google.com/deployment-manager/docs/
The question says - "Dynamic way of provision VMs on Compute Engine" which both the Managed Instance group and the Deployment Manager does, but for different purposes. So here the answer can be more of Deployment Manager as it covers the scope of question, while the Managed Instance group can also dynamically provision VMs based on configuration file but only for auto-healing or horizontal scaling purposes, the answer could have been C if the question was asked as "Dynamic way of provision VMs on Compute Engine for horizontal scaling/auto healing"
Managed Instance Group (option C) and Unmanaged Instance Group (option D) are Compute Engine features that allow you to group related VM instances and manage them as a single entity. However, they do not provide a dynamic way of provisioning VMs based on a configuration file like Deployment Manager does.
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