The type of boring method that can be used for both rock and soils are ________
(a) Shell boring
(b) Wash boring
(c) Auger boring
(d) Rotary boring
The question was posed to me in an interview.
I'm obligated to ask this question of Method of Site Exploration in chapter Stabilisation of Soils, Site Investigation and Sub – Soil Exploration of Geotechnical Engineering II