In Ruby, which keyword is used to refer to the current instance of a class?

A. A mechanism by which a class can hide implementation details from another class B. A mechanism by which a class can inherit properties and behaviors from another class C. A mechanism by which a class can create multiple instances of another class D. None of the above

A. Initializes a superclass object B. Returns the superclass C. Calls the same method in the superclass D. Calls the same method in the subclass

A. def private B. def method.private C. private def D. private

A. Objects of different classes to be treated as objects of a common superclass B. Objects of different classes to have the same methods C. Objects of the same class to have different methods D. Objects of the same class to be treated as objects of different classes