How many objects are available for garbage collection after the following code is runned?

See more:

Java

garbage-collection

class beta{
}
class demo{
	static beta b1;
	beta b2;
	public static void main(String args[]){
		beta b1 = new beta();
		beta b2 = new beta();
		demo d1 = new demo();
		demo d2 = new demo();
		d1.b1=b1;
		d1.b2=b1;
		d2.b2=b2;
		d1= null;
		b1= null;
		b2=null;
	
	}
}

If we add System.out.println(d1.b1); inside main block then the output is beta@3a7f1228
i.e; not null.

What I have tried:

As we can still access d1.b1 so object of d1 is still alive, thus none should be available for gc.
Tell me where i am wrong?
The answer is 1.