If you observe a small filled in circle at the start of the process, which notation is used?

• A. Initial node
• B. Wait time action
• C. Absolute time event
• D. Activity final node

Answer: (A)

The starting point in UML Activity Diagrams is the initial node. It is shown as a solid black circle at the very beginning of the workflow, indicating where control flow starts and that there are no incoming flows to this node—only outgoing connections to the first action or activity. The other symbols describe timing or end points rather than the start: a wait-time action represents a delay, an absolute time event marks a specific moment that triggers something later, and the activity final node signifies the end of the activity. So the small filled circle at the start rightly identifies the initial node.