Object Oriented Data Modeling
The benefits of object-oriented modeling are which of the following?

Improved communication between users, analysts, etc.
All of these
Reusability of analysis, design, and programming results
The ability to tackle more challenging problems

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Object Oriented Data Modeling
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 weaker form of an association relationship.
Expresses an is-a relationship and is a stronger form of an association relationship.

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