Final answer:
Constables are the early form of policing that strictly performed enforcement functions without nonpolice responsibilities, focusing on legal matters rather than community engagement.
Step-by-step explanation:
The forms of policing that strictly performed an enforcement function and had no nonpolice functions are most closely related to the concept of Constables, which was an early form of policing. Unlike community policing or watch and ward systems, constables had specific law enforcement responsibilities without the broader social duties. They were officials appointed to keep the peace in a particular area or community but were focused on legal matters and did not engage in the community-building aspects that characterize other forms of early policing, such as the watch or community-oriented policing strategies.