Question

Which of the following is correct?

(a) A concrete operation is an operation without a body, which cannot be called

(b) An abstract operation has a body, which can be called

(c) A concrete class is a class that cannot be instantiated

(d) None of the mentioned

I have been asked this question in unit test.

I'd like to ask this question from Advanced UML Class Diagrams in division Unified Modelling Language of Software Architecture

Answer 1

Right choice is (d) None of the mentioned

To elaborate: All the statements are incorrect,  An abstract operation is an operation without a body, which cannot be called whereas A concrete operation has a body, which can be called and An abstract class is a class that cannot be instantiated.