Which of the following is TRUE when piece rate system is used for wage determination?

(A) Under this method of remuneration a worker is paid on the basis of time taken by him to perform the work
(B) Under this method of remuneration a worker is paid on the basis of production
(C) The rate is expressed in terms of certain sum of money for total production
(D) The rate is not expressed in terms of certain sum of money for total production