Which of the following is this an example of?

A systems administration team has decided to their systems as immutable instances. They keep the desired state of each of their systems in version control and apply automation whenever they provision a new instance. If there is an issue with one of their servers, instead of troubleshooting the issue they terminate the instance and rebuild it using automation.

Which of the following is this an example of?
A . Inventory
B . Orchestration
C . Infrastructure as code
D . Agentless deployment

Answer: C