Which of the following errors cannot be eliminated by taking both face observations?

- 1
  
  error due to horizontal axis not being perpendicular to the vertical axis
- 2
  
  index error i.e. error due to imperfect adjustment of the vertical circle vernier
- 3
  
  error due to non-parallelism of the axis of telescope level and line of collimation
- 4
  
  None of the above

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