Terraform manages and tracks the state of infrastructure resources through a file known asterraform.tfstate.
This file is automatically created by Terraform and is updated after the application of a Terraform plan to capture the current state of the resources.
* State File Purpose:Theterraform.tfstatefile contains a JSON object that records the IDs and properties of resources Terraform manages, so that it can map real-world resources to your configuration, keep track of metadata, and improve performance for large infrastructures.
* State File Management:This file is crucial for Terraform to perform resource updates, deletions, and for creating dependencies. It's essentially the 'source of truth' for Terraform about your managed infrastructure and services.
References:This behavior is documented in Terraform's official documentation, which explains how the terraform.tfstatefile is used to keep track of the infrastructure Terraform is managing.

Multiple FortiGate-VM instances form an Auto Scaling group to provide highly efficient clustering at times of high workloads. FortiGate-VM instances can be scaled out automatically according to predefined workload levels.

Explanation
The Azure client secret is a one-time value that is only visible when it is created. If the administrator loses or forgets the client secret, they cannot retrieve it from the Azure portal. However, they can create a new client secret and use it to configure Terraform. To create a new client secret, they need to follow these steps12:
Sign in to the Azure portal and navigate to the Azure Active Directory service.
Select the application name under the App Registrations.
Select Certificates & Secrets > New client secret to create a new client secret.
Add a description and an expiration date for the client secret and select Add.
Copy the value of the new client secret immediately as it will not be shown again.
References:
Generate new Client Secret and link to key-vault | Microsoft Learn
Azure Quickstart - Set and retrieve a secret from Key Vault using Azure portal | Microsoft Learn

Explanation
According to the Terraform documentation for installing Terraform on Linux1, you need to download a zip archive that contains a single binary file called terraform. You need to unzip the archive and move the binary file to a directory that is included in your system's PATH environment variable, such as /usr/local/bin. This way, you can run the terraform command from any directory without specifying the full path1.
If you do not move the binary file to the bin directory, you will get a command not found error when you try to run the terraform version command, as shown in the screenshot. To fix this error, you need to move the binary file to the bin directory or specify the full path of the binary file when running the command1.
1: Install Terraform | Terraform - HashiCorp Learn

In using Red Hat Ansible for changing the configuration of a FortiGate VM, the minimum number of files you must create and the file to configure the target FortiGate IP address are:
B:Create two files and use the hosts file.
* Ansible Playbook File (YAML):The playbook file, which is typically a YAML file, contains the desired states and tasks that Ansible will execute on the target hosts.
* Inventory File (Hosts):The inventory file, commonly namedhosts, is where you define the target machines, including the FortiGate VM's IP address. Ansible uses this file to determine on which machines to run the playbook.
By creating these two files, you will have the necessary components to configure Ansible for the deployment.
The playbook contains the automation tasks, and the hosts file lists the machines where those tasks will be executed.
References:This structure is specified in the Ansible documentation, which details the use of playbooks and inventory files to manage and configure target systems.