Pick up the correct statement from the following:

• The void ratio in soils is defined as the ratio of the volume of voids to the volume of solids
• The porosity of a soil is defined as the ratio of the volume of voids to the gross volume of the soil
• The bulk density of a soil is defined as the unit weight of the soil
• The dry density of a soil is defined as weight of solids to the total volume of the soil
• All the above.