Which will show you how to improve by adding or reducing factors in order to make effective the size by the IRS refers to the production units has increased the size and the unit mean DRS take effect size decreases.
This will show you how to improve. By increasing or decreasing factor In order to make effective measures by the IRS refers to a unit that has had to increase the size and DRS means that production units are to be reduced in size.
Which shows how to improve by increasing or decreasing the factors, in order to make effective the size by IRS means has production unit that has the increased size and DRS mean production unit that works on reduced in size.