Question

notation in sequence diagram which is used to represent the period of time the object is active

Answer 1

Answer:

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Activation bar is the box placed on the lifeline. It is used to indicate that an object is active (or instantiated) during an interaction between two objects. ... In a sequence diagram, an interaction between two objects occurs when one object sends a message to another

Explanation:

Answer 2

Notation in sequence diagram which is used to represent the period of time the object is active is called Activation box.

• Activation box represents the period of time an object needs to complete a task.
• When an object is busy by executing a process or it is in waiting state for a reply, use a thin gray rectangle placed vertically on its lifeline.
• It is also used in UML 2.0 notation to contain interactive elements of the diagram.
• A Sequence diagram shows object interactions arranged in time sequence.