Gangsta Industries, INC produces a variety of anti-crime and safety products such as burglar alarms, smoke detectors, surveillance cameras, and specialty locks. Gangsta sells to households, businesses, and government agencies. They have found that each market group requires a different marketing strategy. Gangsta would probably benefit from departmentalization by:

Customer type.

Explanation:

From the scenario described in the question above,   Gangsta Industries would benefit from departmentalization by type of consumer.

In this type of departmentalization, the company groups its activities according to its common customer base, or the types of customers that the organization serves.

This is a strategy that enables the company to better serve a group of specific customers based on their problems, needs and preferences, which results in a more targeted and effective service.