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Aggregation is :

  1. an abstraction through which relationships are treated as lower level entities
  2. an abstraction through which relationships are treated as higher level entities
  3. an abstraction through which relationships are not treated at all as entities
  4. none of the above
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Aggregration is a process when relation between two entity is treated as a single entity. Here the relation between Center and Course, is acting as an Entity in relation with Visitor.

aggregration

Option B


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