Which of the following is available only in Terraform Enterprise or Cloud workspaces and not in Terraform CLI?

Secure variable storage, offering secrets management beyond what the CLI provides locally, is a key feature of Terraform Cloud/Enterprise and not directly available in Terraform CLI in the same centralized, secure manner.

While Terraform CLI can technically provision resources across multiple cloud providers by using separate provider blocks, Terraform Cloud and Enterprise offer a more centralized and managed approach to 'support for multiple cloud providers,' including features like centralized credential management, organizational policy enforcement across providers, and shared state management, which are beyond the scope of a standalone CLI.

Dry runs using `terraform plan` are a fundamental feature available in both Terraform CLI and Terraform Cloud/Enterprise workspaces for previewing changes.

The concept of using workspace information as a data source is largely facilitated by remote backends and state management, which can be done with CLI but is more integrated and robust in Terraform Cloud/Enterprise.