Which element marks the start of alternative sequences in an activity?

Which element marks the start of alternative sequences in an activity?

• A. Decision node
• B. Initial node
• C. Flow final node
• D. Merge node

Answer: (A)

The key idea here is where branching to alternative sequences happens in an activity diagram. A decision node is the point where one flow can split into different paths based on conditions, so it marks the start of alternative sequences. The initial node simply starts the activity, not the split into multiple paths. A merge node brings several paths back together, and a flow final node ends a path. So the element that marks the start of alternative sequences is the decision node.

The key idea here is where branching to alternative sequences happens in an activity diagram. A decision node is the point where one flow can split into different paths based on conditions, so it marks the start of alternative sequences. The initial node simply starts the activity, not the split into multiple paths. A merge node brings several paths back together, and a flow final node ends a path. So the element that marks the start of alternative sequences is the decision node.