Which of the following describes a Start Event in BPMN?

In Business Process Model and Notation (BPMN), a Start Event is crucial for representing the initiation of a process. The correct choice for a Start Event is indicated by a thin circle. This visual representation signifies the starting point of a business process, marking where the process flow commences.

The thin circle design ensures clarity in diagrams, distinguishing the Start Event from other elements like End Events or Intermediate Events, which have different shapes (such as thick-lined circles or double-lined shapes). This distinction allows for an easily understandable flowchart structure, facilitating better communication among stakeholders regarding process designs and executions. Thus, the thin circle effectively conveys the initiation of processes within the BPMN framework.