Which of the following is NOT true of runlevels? Answers: Runlevels categorize functionality by determining in which mode a system will operate. There are seven runlevels on Linux systems. Runlevels help determine which services will be available. Collectively, runlevels are the master process that starts all services. The following are true of system hardening EXCEPT: Answers: A best practice is to start with a complete installation and remove unnecessary packages. It is the process of locking down a system to protect it and any resources that may reside on it. It's more difficult to remove software from a complete installation than to start with a minimal installation. The best approach is to start with a minimal installation and add only software that is absolutely necessary