The following sequence of the operations is performed on a stack PUSH (10), PUSH (20), POP, PUSH (10), PUSH (20), POP, POP, POP, PUSH (20), POP the sequence of values propped out is
1
20, 10, 20, 10, 20
2
20, 20, 10, 10, 20
3
10, 20, 20, 10, 20
4
20, 20, 10, 20, 10