Introduction:
Systems theory is an interdisciplinary approach that views the world as a complex system of interconnected parts. It recognizes that every system, whether it involves humans or not, can be understood as a whole rather than just the sum of its individual parts. This theory takes into account various aspects of the system, including socio-technical systems and open systems.

The Whole System of Anything:
The first option, "The whole system of anything," is the correct answer. Systems theory emphasizes the importance of understanding the entire system rather than focusing solely on its individual components. It recognizes that the behavior and characteristics of a system are influenced by the interactions and relationships among its parts. By considering the whole system, systems theory enables a more holistic and comprehensive understanding of the system's dynamics, functions, and outcomes.

Every System Involving Humans:
While systems theory does encompass systems involving humans, it goes beyond this scope. Systems theory recognizes that humans are an integral part of many systems, including social, organizational, and ecological systems. It acknowledges the interconnectedness and interdependence of human systems and their impact on the larger environment. However, systems theory also acknowledges that non-human systems, such as natural and technological systems, can be understood and analyzed using the same principles.

Socio-Technical Systems:
Systems theory also considers socio-technical systems. These are systems that involve both social and technical components. For example, an organization can be seen as a socio-technical system in which social elements (such as people, culture, and communication) interact with technical elements (such as technology, infrastructure, and processes). Systems theory recognizes the interplay between these different components and how they shape the overall system's behavior and performance.

Open Systems:
Another aspect that systems theory takes into account is open systems. Open systems are systems that interact with their environment, exchanging information, energy, or resources. Unlike closed systems that operate in isolation, open systems are influenced by external factors and can adapt and evolve in response to changes in their environment. Systems theory emphasizes the importance of understanding a system's relationship with its environment and how this interaction impacts the system's functioning and stability.

Conclusion:
In conclusion, systems theory takes into account the whole system of anything, encompassing both human and non-human systems. It recognizes the interconnectedness and interdependence of various system components and emphasizes the importance of considering the system's relationship with its environment. By adopting a systems thinking approach, one can gain a deeper understanding of the complex dynamics and behaviors that emerge from the interactions within and between systems.