Final answer:
The term 'criminal justice' encompasses the police, courts, and corrections, but not investigations explicitly, as it is a role within the police function.
Step-by-step explanation:
The term criminal justice often refers to the comprehensive system that deals with crime and its control, which includes three main components: the police, who enforce the law and apprehend offenders; the courts, which determine guilt and assign punishment; and corrections, the institutions responsible for administering such punishments. In this context, investigations would be considered a function of law enforcement and thus fall under the purview of the police. Therefore, regarding the options provided (corrections, investigations, police, courts), the term criminal justice usually refers to all these aspects except for 'investigations' directly, as it is a sub-component of the police's role rather than a standalone entity within the justice system.