The correct option is Azure Resource Manager template files.

Azure Resource Manager template files are Azure native, declarative infrastructure as code files that let you describe resources, properties, dependencies, and parameters so deployments are predictable and repeatable. You store these templates in source control and deploy them with the Azure portal, the Azure CLI, PowerShell, or CI and CD pipelines to provision consistent environments across subscriptions and resource groups. The templates are idempotent and support parameters and outputs so the same template can be used to create identical infrastructure repeatedly.

Terraform is a powerful infrastructure as code tool but it is not an Azure feature. It is a third party product that manages Azure resources through a provider, so it is not the Azure native solution the question asks for.

GitHub Actions provides automation for building and deploying code and it can run IaC deployments, but it is a CI and CD orchestration service rather than a declarative infrastructure definition format. It does not itself define Azure resources in the way ARM templates do.

Azure Automation Accounts offers runbooks and process automation and it includes configuration management features, but it is focused on operational automation rather than serving as the declarative infrastructure as code format used to define and deploy Azure resources repeatedly.

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