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Aggregation is which of the following?

Expresses a part-of relationship and is a stronger form of an association relationship.
Expresses a part-of relationship and is a weaker form of an association relationship.
Expresses an is-a relationship and is a stronger form of an association relationship.
Expresses an is-a relationship and is a weaker form of an association relationship.

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

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