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Aggregation is which of the following?

  • A.Expresses a part-of relationship and is a stronger form of an association relationship.
  • B.Expresses a part-of relationship and is a weaker form of an association relationship.
  • C.Expresses an is-a relationship and is a stronger form of an association relationship.
  • D.Expresses an is-a relationship and is a weaker form of an association relationship.

Answer: A

Correct answer: Expresses a part-of relationship and is a stronger form of an association relationship.

Aggregation says that one object is part of another - a wheel of a car, a chapter of a book - which is more specific than a plain association. It is nevertheless weaker than composition, in which the part cannot be shared and does not outlive its whole.

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