What is the output of this program?

(a) 0

(b) 1

(c) True

(d) False

import java.util. *; class vector { } public static void main(String args []) { Vector obj= new Vector (4, 2); obj.addElement (new Integer (3)); (new Integer (2)); obj.addElement obj.addElement (new Integer (5) ); obj.removeAll (obj); System.out.println (obj .isEmpty () ); }