The relationship that allows an object of one class to send a message to an object of another class is called ____.

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The relationship described is a dependency. Dependency is a relationship where one class requires another class to perform its function. In this case, one class sends a message to another class, indicating that it requires some functionality provided by that class. This is not inheritance, since inheritance involves creating a new class based on an existing class, and inheriting its properties and methods. It is also not superclass, which refers to a class that is being inherited from. Finally, it is not aggregation, which describes a relationship where one class contains one or more instances of another class as part of its attributes.

The Relationship That Allows an Object of One Class to Send