6 Which of the following assignments in Fruit Driver class are valid or invalid. Give a reason for each. class Fruit 0 class Apple extends Fruit class Orange extends Fruit 0 public class Fruit Driver { public static void main(String[] args) { Fruit f= new Fruit(); Orange o= new Orange; Apple a= new Apple(); o=f; lla //b 11c fro; a=0 O=a; }} (6 Points) //d