Which one of the following statements provides the best argument that direct shear tests are not suited for determining shear parameters of a clay soil?

- 1
  
  Failure plane is not the weakest plane.
- 2
  
  Pore pressures developed cannot be measured.
- 3
  
  Satisfactory strain levels cannot be maintained.
- 4
  
  Adequate consolidation cannot be ensured.

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