What is the notation of a join node?

• A. Line segment with at least two incoming edges and one outgoing edge
• B. Hollow diamond with a single incoming edge and at least two outgoing edges
• C. Line segment with one incoming edge and two outgoing edges
• D. Line segment with two outgoing and two incoming edges

Answer: (A)

Joining means multiple paths come together into one path, so the notation should show more than one input and a single output. A line segment with at least two incoming edges and one outgoing edge fits this, signaling that several flows are merged into a single downstream flow. The hollow diamond with one incoming and multiple outgoing edges represents a decision or split, not a merge. A line segment with one incoming and two outgoing edges is a split/fork, not a join. Two incoming and two outgoing edges would depict a more complex junction rather than a simple merge into one path.