The line from the actor to the use case is called a(n)_____.
A) association
B) aggregation
C) lifeline
D) observation

Question

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The line from the actor to the use case is known as an association. It represents the communication between the actor and the use case, indicating that the actor is associated with the use case. Aggregation refers to a relationship in which a whole is made up of parts (e.g., a car consists of an engine, wheels, and other components). A lifeline represents the timeline of an object or actor as it interacts with a use case, and an observation is a notation used in sequence diagrams to denote messages passed between objects.

The Line from the Actor to the Use Case Is