Consider the following railway zones:
1. North-Eastern Railway
2. Central Railway
3. North-Western Railway
4. South-Eastern Railway
Which one of the following is the correct order of locations of the headquarters of the above railway zones from west to east ?
(a) 1-2-3-4
(b) 2-3-1-4
(c) 3-2-4-1
(d) 3-4-2-1