Thetop collapsed pool(e.g., “pizza supplier”) is ablack-box pool. Even though its internal process is hidden, itstill represents a participant.
Themiddle pool(e.g., “pizza delivery”) is awhite-box poolshowing its internal process — a second participant.
Thebottom pool(e.g., “pizza receiving”) is anotherwhite-box pool— a third participant.
BPMN defines thatevery pool (black-box or white-box) corresponds to one participantin the collaboration. Therefore, the collaboration showsthree participants, and answerDis correct.
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