What is a merge node?

What is a merge node?

• A. Marks the end of alternative sequences in an activity
• B. Marks the start of concurrent sequences in an activity
• C. Represents a lifeline
• D. Indicates a data store

Answer: (A)

Merge nodes control how control flow from alternative paths reunites in an activity diagram. After a decision splits the work into different branches, the merge node brings those branches back into a single outgoing flow so the next steps can continue in one line. This is different from starting concurrent sequences—that’s handled by a fork node. It isn’t a lifeline (a sequence diagram concept) or a data store (not part of activity diagrams). So a merge node marks the end of alternative sequences in an activity.

Merge nodes control how control flow from alternative paths reunites in an activity diagram. After a decision splits the work into different branches, the merge node brings those branches back into a single outgoing flow so the next steps can continue in one line. This is different from starting concurrent sequences—that’s handled by a fork node. It isn’t a lifeline (a sequence diagram concept) or a data store (not part of activity diagrams). So a merge node marks the end of alternative sequences in an activity.