Question:Which of the following statements regarding abstract classes are true? 

A All methods declared in an abstract class must be abstract. 
B Any subclass (abstract or concrete class) of an abstract class must implement all the methods declared in the parent abstract class. 
C Any concrete class must implement all the methods of the parent abstract class which are not implemented in the super hierarchy tree. 
D The abstract class may have method implementation. 

+ Answer
D 

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Mohammad Towhidul Islam

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