5 4(X> y) && (y 0) I only II only O III only I and III only OII and III only Multiple Choice 6. What is output by the following code? (2 points) ArrayList a-new ArrayList); ArrayList b = a; a.add(new Integer(4); b.add(new Integer(5)); a.add(new Integer(6)); b.add(new Integer(7); System.out.println(a.get(1)); An IndexOutOfBoundsException occurs. 4 O5 Multiple Choice 7. To implement an interface, a class must: (2 points) O implement all methods defined in the in O implement at least one method from the interface O add new definitions to the interface specify the keyword "extends." invoke "super" in its constructors. terface Multiple Choice 8. Which keyword is required if you want a method to always be overridden in a subclass? (I point) private static int O final Oabstract