An administrator uses a tool to perform roiling deployments when the production application needs to be updated. The tool temporarily removes 10% of the systems from the load balancer at a time and it

Infrastructure as Code represents the practice of managing and provisioning infrastructure through machine-readable configuration files rather than manual processes; the described tool embodies IaC by codifying the rolling deployment strategy, load balancer integration, and rollback behavior, making the deployment process repeatable, auditable, and version-controlled using tools such as Ansible or Chef.

Infrastructure automation is a broader term for any automated execution of IT tasks and does not specifically capture the code-driven, declarative definition of deployment workflows with rollback that characterizes IaC.

Agent-based architecture refers to management software agents installed on each node that report state to a central controller, and does not describe a deployment orchestration strategy.

Build automation refers to automated compilation, testing, and packaging of source code artifacts, not the orchestration of deployments to production systems.

Inventory management refers to cataloguing and tracking hardware and software assets, not orchestrating rolling application deployments.