Which of the following statements are correct? (Choose all that apply.)
b, c, e, f
Note the use of can, must, and might or might not in these options.
Note that this isn't a test on English grammar or vocabulary.
The meaning of an exam question will completely change depending on whether it uses "can" (feasible), "must" (mandatory), or "might" (optional) in a question.
Option (a) is incorrect because it isn't mandatory for an abstract class to define instance variables.
Option (d) is incorrect because the constructor of all base classes-concrete or abstract-must be called by their derived classes.
Option (f) is a correct statement.
The combination of final and abstract modifiers is incorrect.
An abstract method is meant to be overridden in the derived classes, whereas a final method can't be overridden.