abswer fast

Which line of the following program causes ClassCastException? class Animal{} class Dog extends Animal{} class Wolf extends Animal{} public class HelloWorld{ public static void main (String[] args) { Animal a; Dogd = new Dog(); //Line1 Wolf w = new Wolf(); //Line2 a = d; d = (Dog) a; //Line 3 Line4 W = (Wolf) a; //Line5 } } Select one a Line 3 bLine 4 Eine 5