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What is the relationship called when a class 'has-a' instance of another class?

Encapsulation

Aggregation

Composition

Composition is used to describe a relationship between two classes where one class is composed of one or more objects of another class. The other options are incorrect because

A. Encapsulation is used to hide the internal workings of an object and protect it from outside interference.

B. Aggregation is used to describe a relationship where one class has a reference to another class, but the referenced class can exist without the first class.

D. Inheritance is used to describe a relationship where one class derives attributes and behavior from a parent class.

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Inheritance