A production system has a product type of layout in which there are four machines laid in series. Each machine does a separate operation. Every product needs all the four operations to be carried out. The designed capacity of each of the four machines is 200, 175, 160 and 210 products per day. The system capacity would be
(a) 210 products per day
(b) 200 products per day
(c) 175 products per day
(d) 160 products per day