Pick up the correct statement from the following :

• To an agriculturist, soil is the substance existing on the earth's surface, which grows and develops plants
• To a geologist, soil is the material in a relatively thin surface zone within which roots occur, and rest of the crust is termed as rock irrespective of hardness
• To an engineer, soil is the unaggregated and uncemented deposits of minerals and organic particles covering the earth's crust
• All the above.