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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Object Oriented Data Modeling
The object-oriented development life cycle is which of the following?

Analysis, design, and implementation steps in any order and going through the steps no more than one time.
Analysis, design, and implementation steps in the given order and using multiple iterations.
Analysis, design, and implementation steps in the given order and going through the steps no more than one time.
Analysis, design, and implementation steps in any order and using multiple iterations.

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