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

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

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Object Oriented Data Modeling
An abstract class is which of the following?

A class that has direct instances, but whose descendants may have direct instances.
A class that has no direct instances, but whose descendants may have direct instances.
A class that has direct instances, but whose descendants may not have direct instances.
A class that has no direct instances, but whose descendants may not have direct instances

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