Which of the below are paid features of Terraform Cloud?

Full API Coverage is a fundamental aspect of Terraform Cloud and is generally available across all tiers, including the free tier, to automate workflows.

Secure variable storage is a crucial security feature of Terraform Cloud, available in the free tier to protect sensitive information used in configurations.

Roles/Team management is a core feature of Terraform Cloud's paid tiers, enabling organizations to define granular access controls and collaborate efficiently with multiple users and teams.

Cost Estimation, part of Terraform Cloud's Cost Management capabilities, is available in paid plans to provide insights into potential infrastructure costs before applying changes.

The Private Module Registry is available in the free tier of Terraform Cloud, allowing organizations to privately share and manage Terraform modules.

Sentinel policies are HashiCorp's policy as code framework, integrated into Terraform Cloud's Team & Governance and Business tiers to enforce compliance rules on infrastructure provisioning.