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Which of these workflows is only enabled by the use of Infrastructure as Code?
Correct Answer: D
Rationale for Correct Answer: IaC enables reviewable, version-controlled change proposals (for example, Terraform plans in pull requests). This makes it possible to systematically review proposed infrastructure changes-including automated security/policy checks-before they are applied. That review-and-approve workflow is a direct outcome of defining infrastructure as code and generating an execution plan. Analysis of Incorrect Options (Distractors): A: Auto scaling is enabled by cloud services (e.g., ASGs, autoscalers) and can be configured with or without IaC. B: RBAC is a capability of cloud/IAM platforms and can be managed without IaC (though IaC can codify it). C: Cost optimization is a practice/process; IaC can help standardize and enforce cost controls, but it's not "only enabled" by IaC. Key Concept: IaC enables version control, change review, and pre-deployment validation (plan + policy /security review). Reference: Terraform Objectives - Understand Infrastructure as Code (IaC) Concepts (reviewable, repeatable workflows), Understand Terraform Basics and CLI (plan as a change proposal).