What is the output of this program?

(a) H

(b) Hello

(c) Runtime Error

(d) Compilation Error

import java.util. *; public class genericstack { Stack stk = new Stack (); public void push (E obj) { } stk.push (obj); } public E pop () { } E obj } stk.pop(); } class Output { public static void main(String args[]) { genericstack gs = new genericstack (); return obj; gs.push ("Hello"); System.out.println (gs.pop());