AA managed platform by HashiCorp that runs Terraform and stores state for teams
BA separate language that replaces HCL for writing cloud infrastructure at scale
CA command-line tool you install locally to apply Terraform without any account
DA public registry that only hosts verified providers for large organizations
Why this is the answer
HCP Terraform (formerly Terraform Cloud) is a hosted service for remote runs, state, and collaboration. The local CLI is the Community Edition, a different thing.