What is the output of this program? 

(a) [3, 5]

(b) [3, 2]

(c) [3, 2, 5]

(d) [3, 5, 2]

import java.util. *; class stack { public static void main(String args []) { Stack obj= new Stack(); obj.push (new Integer (3)); obj.push (new Integer (2)); obj.pop(); obj.push (new Integer (5)); System.out.println (obj);