choose all correct answer

Which of the following are true when creating a subclass that extends from a superclass in Java? If the superclass constructor is being called in your subclass constructor, it must called in first line of the subclass constructor. You must explicitly include a call to the superclass constructor in every subclass constructor or an error will occur. A subclass can only extend from one superclass. There must be an is-a relationship between a superclass and a subclass