Correct Answer - Option 1 : 1 and 2

**Explanation:**

(i) The sample disturbance depends on the design features of a sampler (cutting edge, inside wall friction and non-return valve) and the method of sampling.

(ii) Disturbance can be measure in terms recovery ratio, which is

\({L_r} = \frac{{{\mathop{\rm Re}\nolimits} {\mathop{\rm cov}} ered\ length\ of\ sample}}{{penetration\ length\ of\ sample}}\)

If, L_{r} = 1, Good recovery

L_{r }> 1, Sample of swelled

L_{r }< 1, Sample of shrunk or compressed