Concept:Restarting a computer that is already on is called warm booting.Explanation:When a computer is already running and the user restarts it, the system reloads the operating system without cutting off power.This process is known as warm booting.Cold booting, on the other hand, means starting a computer from a powered-off state.Since the question refers only to restarting, the correct term is warm booting.Answer:C. warm booting