If $k_{0}$ is the coefficient of earth pressure at rest, $k_{a}$ is the coefficient of active earth pressure, $k_{p}$ is the coefficient of passive earth pressure and $μ$ is Poisson's ratio, then the value of $(1 - μ) / μ$ is given by

- 1
  
  $k_{a} / k_{p}$
- 2
  
  $k_{o} / k_{a}$
- 3
  
  $k_{p} / k_{o}$
- 4
  
  $1 / k_{o}$

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