Answer :

Final answer:

In sequence diagrams, a lifeline does not always continue down the entire page.

Explanation:

It only extends as far down as the longest-running object it represents. The length of a lifeline is determined by the time period during which the participant it represents is involved in the activities being modeled. In the context of sequence diagrams used in systems analysis and software engineering, a lifeline does not always continue down the entire page. Rather, it only needs to extend as far down as the longest-running object it represents.

This is because a lifeline represents an individual participant in the interaction, such as a person or a system, indicating the existence of the participant over time. When the interaction involving that participant ends, the lifeline can end as well. Essentially, the length of a lifeline is determined by the time period during which the corresponding participant is involved in the activities being modeled.

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