In Object-Oriented metrics, Coupling Between Object Classes (CBO) measures:

Topic: Software Quality
Subtopic: Object-Oriented Metrics

AThe total methods in a class hierarchy

BThe depth of the inheritance tree

CThe number of unit tests written for a class

DThe number of other non-inherited classes to which a class is coupled

Explanation

CBO counts non-inherited class references; high CBO indicates tight coupling and reduced maintainability.

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