You need to migrate a workspace to use a remote backend. After updating your configuration, what command do you run to perform the migration?

The correct choice is to use the terraform init command to perform the migration of a workspace to a remote backend. This command initializes the Terraform configuration. When you change the backend configuration in your Terraform setup to switch to a remote backend, running terraform init is necessary because it prepares your working directory for other commands by setting up the specific backend, downloading necessary plugins, and ensuring everything is configured correctly.

During this initialization, Terraform recognizes the backend change and handles the migration of the existing state file to the new remote backend. This process includes any state file modifications needed to align the current state with the remote backend management, ensuring that your resources are correctly tracked and managed in the new environment.

The other options do not serve the purpose of migrating a workspace to a remote backend. For instance, using terraform apply would attempt to apply any changes in your configuration but would not address backend migration. Similarly, terraform migrate is not a valid command in Terraform, and terraform push is not used for backend migration; it is associated with specific workflow processes in some tools, but not standard Terraform functionality. Thus, running terraform init is the proper step for handling the backend migration process effectively.