Consider the following statements:

1.   Dynamic cone penetration test for site investigation is based on the principlethat elastic shock waves travel in

     different materials at different velocities.

2.   Electrial resistivity method of subsurface investigation is capable of detecting only the strata having different

      electrical resistivity.

3.   In-situ vane shear test is useful for determining the strength of very soft soil and sevsitive clays and is unsuitable

      for sandy soil.

Of these statements