Simple question about java inheritance

QuizInheritance.java

/**
 * What will be printed to standard output?
 * 
 * a) The code will not compile.
 * b) The code compiles and "5, Super" is printed to standard output.
 * c) The code compiles and "5, Sub" is printed to standard output.
 * d) The code compiles and "2, Super" is printed to standard output.
 * e) The code compiles and "2, Sub" is printed to standard output.
 * f) The code compiles, but throws an exception.
 */
public class QuizInheritance {  
    
    class Super {  
        int index = 5;
        public void printVal() {  
            System.out.print( "Super" );
    	}
    }
    
    class Sub extends Super {  
    	int index = 2;
    	public void printVal() {  
    	    System.out.print( "Sub" );
    	}
    }
    
    public void test() {
    	Super sup = new Sub();
        System.out.print( sup.index + ", " );
        sup.printVal();
    }
    
    public static void main( String argv[] ) {  
    	(new QuizInheritance()).test();
    }
}