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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; Dog d = new Dog(); //Line1 Wolf w = new Wolf(); //Line2 a = d; 7/Line3 d = (Dog) a; //Line4 W = (Wolf) a; //Line5 } } Select one: a.Line 2 b.Line 4 C.Line 3 d. Line 1 e.Line 5