Final answer:
The main types of organizational structure are Functional, Projectized, and Matrix. These structures define how tasks are divided, coordinated, and supervised in an organization. Regulatory is not an organizational structure but refers to compliance with standards and rules.
Step-by-step explanation:
The types of organizational structure typically referenced in the context of formal organizations such as businesses, and bureaucracies include Functional, Projectized, and Matrix. The Functional structure organizes the company based on specialized functions, such as marketing, finance, and human resources. The Projectized structure is generally used by organizations that run operations as a series of projects, with project managers having a great deal of autonomy and authority. Lastly, the Matrix structure is a hybrid of functional and projectized characteristics, embodying a blend of divisional and functional structures to leverage the benefits of both worlds.
The fourth option, 'Regulatory', is not typically classified as a type of organizational structure; rather, it pertains to the rules and regulations that an organization must comply with. Large organizations, such as hospitals, schools, and governments, tend to be heavily bureaucratized irrespective of their specific organizational structure, highlighting the importance and pervasiveness of bureaucracy in formal organizations.