The line: virtual double earnings() const = 0; appears in a class definition. You cannot deduce that:
a. All classes that directly inherit from this class will override this method.
b. This class is an abstract class.
c. Any concrete class derived from this class will have an earnings function.
d. This class will probably be used as a base class for other classes.
a. All classes that directly inherit from this class will override this method.
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