The following are the methods of estimating reproduction cost, EXCEPT_________. a. It establishes cost square meter for the subject building and multiplies that cost by the square meter of the subject building to arrive at the reproductive cost b. It is based on the used of installed price for various building materials, employing units convenient to use such as square meters c. It has certain useful life expectancy of units of income. d. It comprises the detailed inventory of all materials, labor and other costs that will be needed for the reproduction, used by Architects, Engineers, Builder and Contractors