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 ? [Asstt Commt 2010] (a) 1-2-3-4 (b) 2-3-1-4 (c) 3-2-4-1 (d) 3-4-2-1