production involves the use of one or more base modules onto which options can be added according to specifications in customer orders.

A$)$ Assemble$-$to$-$order $($ATO$)$

B$)$ Make$-$to$-$stock $($MTS$)$

C$)$ Make$-$to$-$order $($MTO$)$

D$)$ Engineer$-$to$-$orders $($ETO$)$