Four parts (A, B, C, and D) are processed through a sequence offour operations (1, 2, 3, and 4). Not all parts are processed inall operations. Part A, which has weekly quantities of 70 units, isprocessed through operations 1, 2, and 3 in that order. Part which has weekly quantities of 90 units, is processed through operations 2, 4, and 1 in that order. Part C, which has weekly quantities of 65 units, is processed through operations 3, 2, and 4in that order. Finally, part D, which has weekly quantities of 100units, is processed through operations 2, 1, and 4 in that order.(a) Draw the network diagram and (b) prepare the From-To table for this work system.