Which component is critical in defining a "system"?

A system is defined by components that interact and work together to fulfill a specific purpose or achieve a common goal. The critical aspect of a system is its interconnectedness, where various parts contribute to a larger function or outcome. This synergy among the components allows the system to operate effectively, as each part plays a role that supports the overall intention of the system.

When considering the options, actions that fulfill a definite purpose encapsulate this idea well, as they emphasize the functionality and goal-oriented nature of a system. Without a purpose, the interactions and components become mere parts without significance to a greater whole.

In contrast, elements that work independently, parts that operate only in isolation, and components that have no connection do not promote the concept of a system. Such characteristics suggest disjointed parts rather than a cohesive, functioning whole, neglecting the fundamental principle that defines a system as interconnectedness towards a shared goal.