What will be printed by this program? public class Question4 ( static String s1, s2,s3, s4; public static void main (String[] args) { s1= new String ("CAT"); s2 = new String ("DOG"); s3 new String ("RAT"); animal (s1, s2); System.out.println (mixThem (s2, s3)); } //main private static void animal (String al, String a2) { if (al.equals (a2)) System.out.println (al); else System.out.println (a2); } private static String mixThem (String bl, String b2) { String cl= bl; b1 = b2; b2 = new String ("HAT"); System.out.println (bl); System.out.println (b2); System.out.println(cl); System.out.println (s2); return b2; } //Question4