Answer: Line operation
Explanation: The line OPERATION units in a police department are those charged with maintaining and carrying out one of the main function of the police department. The line operation unit are tasked with the prevention and investigation of crime in other to create an enabling and secure environment devoid of crime. The are tasked with implementing the daily field activities of the police department which includes daily patrol, crime prevention and investigation. Line operation follows an hierarchical pathway in disposing it's duties.