Answer :
Final answer:
The activation lifeline is depicted using a solid vertical line under an object on a sequence diagram.
Explanation:
The statement is False:
An activation lifeline, in the context of sequence diagrams in UML (Unified Modeling Language), is actually depicted using a solid vertical line underneath an object, rather than a dashed line.
For example, if you have an object named 'User' and you want to represent the time period during which the 'User' object is active, you would use a solid vertical line underneath the 'User' object on the sequence diagram.
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