A variable defined within a class but outside any method is called ..... O a class reference a reference a constructor an attribute A mutator can only change the class' attributes if they are public, not private should never be used to change the class' attributes is used in main to change a class' attributes. should be used by methods within the class to change the class' attributes A method can access any attribute defined as private in the same class. False. The attribute has to be declared public False. It has to use mutators O False. It has to use accessors True