Which is a correct statement about configuration management?

Configuration management uses infrastructure as code (IaC) to prevent drift with the applied theory of Idempotence. Idempotence states that only required changes will be applied to servers that fall outside of the desired system state. Infrastructure as a service (IaaS) is a cloud model that defines components that can be purchased for a period, such as virtual router, switches, and virtual machines (VMs), just to name a few. Configuration management can install the Network Time Protocol (NTP) so time does not drift, but NTP will not prevent configuration drift. Configuration management software does not always require per-host licensing. Most configuration management utilities offer a community edition that is free; if you want enterprise features, you can then purchase licensing from the parent company.