Which statement about immutable infrastructure is correct?

• A. Immutable replaces components for changes; mutable patches existing ones
• B. Mutable patches running components
• C. Immutable infrastructure patches live components
• D. Neither approach affects deployment

Answer: (A)

Immutable infrastructure means you don’t modify a running server. When you need a change, you build a new version of the component and replace the old one, then route traffic to the new instance. This makes deployments predictable, reproducible, and easy to roll back because every deployment is a fresh artifact defined by code. The statement that best captures this is that changes are made by replacing components rather than patching the existing ones. In contrast, descriptions that talk about patching the running components describe mutable infrastructure, and saying patches don’t affect deployments is inaccurate.