Which of the Following Best Explains 'Assembly to Order (ATO)

Multiple Choice

Which of the following best explains 'assembly to order (ATO) '? 

A)  Only raw materials and components are kept in stock. 
B)  All activities are planned based upon customer order. 
C)  There is no stock held at all. 
D)  Manufacture takes place based on forecasts and final assembly takes place based on customer orders.