Answer :
The correct answer to this question is a. association.
In UML, an association is a relationship between two or more objects that describes how they are connected or interact with each other. In this case, the line from the actor to the use case represents the relationship between the actor and the use case. The actor is an external entity that interacts with the system, while the use case represents a specific function or feature of the system. The association between the actor and the use case is important because it helps to define the scope and requirements of the system. It also helps to ensure that the system is designed and developed to meet the needs of the users. I have explained the concept of association and how it relates to the actor and use case in UML modeling.
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