Pick up the correct statement from the following:

The earth work of cutting in trenches or borrow pits in fairly uniform ground is measured with the help of average depths of the dead men

The earth work in trenches or borrow pits in irregular ground is measured by taking the difference in levels before and after completion of work

The earth work in trenches or borrow pits, where neither a nor b is feasible, are measured from the fillings after deduction of voids