Pick up the correct statement from the following

Q. Pick up the correct statement from the following:

A.            In order to check up the average depth of excavation, ‘Dead man s’ are left at the mid-widths of borrow pits

B.            The earthwork calculation in excavation is made from the difference in levels obtained with a level

C.            The earth work in excavation to form the road embankment includes the formation of correct profile and depositing the soil in layers

D.            All the above

Answer: All the above