A programmer designs an ExamResult instantiable class which contains the following private instance fields:

boolean$[]$ answeredCorrectly

int totalPointsEarned

String studentName

The class also contains methods to access and modify these values, while imposing certain constraints $($e$.$g$.,$ totalPointsEarned cannot exceed the maximum possible points on the exam$).$ This is an example of the Object$-$Oriented Design principle of: