Under which circumstance can an instance variable be moved to an abstract class?
A) when it refers to the same type of data structure
B) when it is unique to a particular concrete class
C) when different data structure types are referenced by the variable
D) when it directly modifies the underlying data structure

Question

Quizplus · Accepted Answer

Instance variables can be moved to an abstract class when they refer to the same type of data structure across all subclasses. This ensures that all subclasses can inherit the variable, maintaining a consistent structure and reducing code duplication.

Under Which Circumstance Can an Instance Variable Be Moved to an Abstract