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------------------------------------------------ Q4: In sequence diagrams, what graphical notations will you use to denote the following?

- The objects and actors
- Interactions
- Lifelines of objects

In sequence diagrams, objects and actors are represented by rectangles or stick figures, interactions are represented by arrows, and lifelines of objects are represented by vertical dashed lines.

Explanation:

In sequence diagrams, the following graphical notations are used:

Objects and actors: Objects and actors are represented by rectangles or stick figures. Objects are typically labeled with their names, while actors are labeled with the role they play in the system.
Interactions: Interactions between objects and actors are represented by arrows. The arrows indicate the flow of messages between different components of the system.
Lifelines of objects: Lifelines of objects are represented by vertical dashed lines. These lines represent the lifespan of an object during the execution of the sequence diagram.

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