A fellow developer wants to keep a specific AWS instance while refactoring Terraform code. What command should be used to tell Terraform to no longer manage the resource?

The command to use in this scenario is designed to remove a specific resource from Terraform's state management while leaving the actual resource intact in your cloud provider's environment. Using the command to remove the resource from the state file prevents Terraform from trying to manage or make changes to that resource in future runs.

When you execute the command that corresponds to the correct answer, Terraform will update its state file to reflect that it no longer manages the specified AWS instance. This is particularly useful in situations like refactoring Terraform code or when you temporarily want to maintain the existence of a resource independently from Terraform.

By contrast, other options serve different purposes. For instance, using a command to destroy the resource would mean that Terraform would actually terminate the instance, which is not what the developer intends. Commands that suggest "detach", "remove", or similar, are not valid Terraform commands; hence, they would not achieve the desired effect of modifying the management of resources within Terraform.

In summary, using the specified command accurately reflects the intention to stop Terraform's management of the specified AWS instance while ensuring the instance remains in the AWS environment.