Which two components can a connection block be nested within?

The connection block in Terraform is used to specify how Terraform can connect to a resource for running commands or scripts, typically in the context of a provisioner. Provisioners are responsible for executing scripts on a remote resource during the creation or destruction of that resource.

When a connection block is nested within a provisioner, it allows you to define specifics about how to reach the target resource, such as the type of connection (SSH, WinRM, etc.), the username, password, host, and other relevant details. This makes it important to connect effectively and carry out the provisioning actions as intended.

While the connection block is not typically nested within modules, resources, or providers directly, its specific role within provisioners allows Terraform to perform operations on provisioned resources by establishing the necessary connection details. Thus, the correct context for nesting a connection block is indeed within a provisioner.