What will be the result of compiling and running the given program? 
Select one correct answer. 
1 class AA{}
2 class BB extends AA{}
3 class Q6
4 {
5 public static void main(String arg[])
6 {
7 AA a=null;
8 BB b=(BB)a;
9 System.out.println(b);
10 System.out.println(b instanceof BB);
11 System.out.println(b instanceof AA); 
12 }
13 }
