What is the output of the following program? public class Stack protected static final int CAPACITY = 100; protected int size,top = -1; protected Object stk[]; public Stack() stk = new Object[CAPACITY]; public void push(Object item) if(size_of_stack==size) System.out.println("Stack overflow"); return; else top++; stk[top]=item; public Object pop() if(top<0) return -999; else Object ele=stk[top]; top--; size_of_stack--; return ele; public class StackDemo public static void main(String args[]) Stack myStack = new Stack(); myStack.push(10); Object element1 = myStack.pop(); Object element2 = myStack.pop(); System.out.println(element2);

Answer: Option D