In a sequence diagram, what does a lifeline represent?a.The duration of time during which an object is actively processing a messageb.The vertical space allocated for an object, showing its existence over timec.The number of messages exchanged between two objectsd.The order in which messages are exchanged between objects
Question
In a sequence diagram, what does a lifeline represent?a.The duration of time during which an object is actively processing a messageb.The vertical space allocated for an object, showing its existence over timec.The number of messages exchanged between two objectsd.The order in which messages are exchanged between objects
Solution
In a sequence diagram, a lifeline represents the vertical space allocated for an object, showing its existence over time. It is a visual representation of the object's presence during the interaction. The lifeline begins with a solid rectangle representing the object, and the line (dashed or solid) extending down from this represents the object's life during the interaction. The length of the line does not necessarily indicate the object's lifespan. The line ends whenever the object's participation in the interaction ends.
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