Consider the following surveys.

Reconnaissance survey

Preliminary survey

Traffic survey

Location survey

The correct sequence in which these surveys are conducted before the alignment of a track is finalised is

- 1
  
  1, 3, 2, 4
- 2
  
  1, 3, 4, 2
- 3
  
  3, 1, 4, 2
- 4
  
  3, 1, 2, 4

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