Which of the following is true regarding subclasses?

Asubclass that inherits methods from its superclass may not override the methods.

A subclass that inherits instance variables from its superclass may not declare additional instance variables.

Asubclass may inherit methods or instance variables from its superclass but not both.

Asubclass may inherit methods and instance variables from its superclass, and may also implement its own methods and declare its own instance variables.