Which of the following class definitions defines a legal abstract class?
a. class A { abstract void unfinished() { } }
b. class A { abstract void unfinished(); }
c. abstract class A { abstract void unfinished(); }
d. public class abstract A { abstract void unfinished();
c. abstract class A { abstract void unfinished(); }
In A and B, abstract keyword is missing for the class. In D, class and abstract are in a wrong order. The correct answer is C.
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