1. public class test { 
	2. public static string output = “” 
	3.   
	4. public static void foo(int i) { 
	5. try { 
	6. if(i= =1) { 
	7. throw new Exception (); 
	8. } 
	9. output += “1”; 
	10.} 
	11. catch(Exception e)  { 
	12. output += “2”; 
	13. return; 
	14.} 
	15. finally ( 
	16. output += “3”; 
	17. ) 
	18. output += “4”; 
	19. }
	20.   
	21. public static void main (string args[])  ( 
	22. foo(0); 
	23. foo(1); 
	24.   
	25. ) 
	26. }
	What is the value of the variable output at line 24?()