Which of the following is the correct sequence of the grades of officers in the Central Secretariat?
Secretary
Additional Secretary
***** Secretary
Deputy Secretary
Under Secretary
Director
(a) 1, 2, 3, 6, 4, 5
(b) 2, 1, 3, 5, 4, 6
(c) 6, 4, 3, 5, 2, 1
(d) 1, 5, 4, 2, 6, 3