A triaxial test was conducted on a granular soil. At failure $σ_{1}' / σ_{3}' = 4$ . The effective minor principal stress at failure was 100 kPa. The values of approximate $ϕ$ and the principal stress difference at failure are, respectively

- 1
  
  $45 ° and 570 kPa$
- 2
  
  $40 ° and 400 kPa$
- 3
  
  $37 ° and 300 kPa$
- 4
  
  $30 ° and 200 kPa$

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