The following consecutive readings were taken with a dumpy level and a 3m staff on a continuously sloping ground.

0.425, 1.035, 1.950, 2.360, 2.950, 0.750, 1.565, 2.450, 0.320, 1.025, 2.165, 2.955

Which of the following readings are backsight?

- 1
  
  0.425, 2.950, 0.750, 0.320
- 2
  
  0.425, 0.750, 0.320, 2.955
- 3
  
  0.425, 0.750, 0.320
- 4
  
  0.425, 2.360, 0.750, 0.320

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